Python pip.req.req_uninstall 模块，UninstallPathSet() 实例源码

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = pkg_resources.Requirement.parse(req)
            except pkg_resources.RequirementParseError:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = req.extras

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        self.markers = markers
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated

def __init__(self, req, comes_from, source_dir=None, editable=False,
                 link=None, as_egg=False, update=True,
                 pycompile=True, markers=None, isolated=False, options=None,
                 wheel_cache=None, constraint=False):
        self.extras = ()
        if isinstance(req, six.string_types):
            try:
                req = Requirement(req)
            except InvalidRequirement:
                if os.path.sep in req:
                    add_msg = "It looks like a path. Does it exist ?"
                elif '=' in req and not any(op in req for op in operators):
                    add_msg = "= is not a valid operator. Did you mean == ?"
                else:
                    add_msg = traceback.format_exc()
                raise InstallationError(
                    "Invalid requirement: '%s'\n%s" % (req, add_msg))
            self.extras = _safe_extras(req.extras)

        self.req = req
        self.comes_from = comes_from
        self.constraint = constraint
        self.source_dir = source_dir
        self.editable = editable

        self._wheel_cache = wheel_cache
        self.link = self.original_link = link
        self.as_egg = as_egg
        if markers is not None:
            self.markers = markers
        else:
            self.markers = req and req.marker
        self._egg_info_path = None
        # This holds the pkg_resources.Distribution object if this requirement
        # is already available:
        self.satisfied_by = None
        # This hold the pkg_resources.Distribution object if this requirement
        # conflicts with another installed distribution:
        self.conflicts_with = None
        # Temporary build location
        self._temp_build_dir = None
        # Used to store the global directory where the _temp_build_dir should
        # have been created. Cf _correct_build_location method.
        self._ideal_build_dir = None
        # True if the editable should be updated:
        self.update = update
        # Set to True after successful installation
        self.install_succeeded = None
        # UninstallPathSet of uninstalled distribution (for possible rollback)
        self.uninstalled = None
        # Set True if a legitimate do-nothing-on-uninstall has happened - e.g.
        # system site packages, stdlib packages.
        self.nothing_to_uninstall = False
        self.use_user_site = False
        self.target_dir = None
        self.options = options if options else {}
        self.pycompile = pycompile
        # Set to True after successful preparation of this requirement
        self.prepared = False

        self.isolated = isolated