Python __builtin__ 模块，basestring() 实例源码

def _flags_to_int(flags):
    # Note, that order does not matter, libev has its own predefined order
    if not flags:
        return 0
    if isinstance(flags, integer_types):
        return flags
    result = 0
    try:
        if isinstance(flags, basestring):
            flags = flags.split(',')
        for value in flags:
            value = value.strip().lower()
            if value:
                result |= _flags_str2int[value]
    except KeyError as ex:
        raise ValueError('Invalid backend or flag: %s\nPossible values: %s' % (ex, ', '.join(sorted(_flags_str2int.keys()))))
    return result

def _flags_to_int(flags):
    # Note, that order does not matter, libev has its own predefined order
    if not flags:
        return 0
    if isinstance(flags, integer_types):
        return flags
    result = 0
    try:
        if isinstance(flags, basestring):
            flags = flags.split(',')
        for value in flags:
            value = value.strip().lower()
            if value:
                result |= _flags_str2int[value]
    except KeyError as ex:
        raise ValueError('Invalid backend or flag: %s\nPossible values: %s' % (ex, ', '.join(sorted(_flags_str2int.keys()))))
    return result

def inline(f, *args, **kwds):
    if isinstance(f, basestring):
        global _cython_inline
        if _cython_inline is None:
            from Cython.Build.Inline import cython_inline as _cython_inline
        return _cython_inline(f, *args, **kwds)
    else:
        assert len(args) == len(kwds) == 0
        return f