我们从Python开源项目中，提取了以下18个代码示例，用于说明如何使用traceback.py()。
def get_records(self, etb, number_of_lines_of_context, tb_offset): try: # Try the default getinnerframes and Alex's: Alex's fixes some # problems, but it generates empty tracebacks for console errors # (5 blanks lines) where none should be returned. return _fixed_getinnerframes(etb, number_of_lines_of_context, tb_offset) except UnicodeDecodeError: # This can occur if a file's encoding magic comment is wrong. # I can't see a way to recover without duplicating a bunch of code # from the stdlib traceback module. --TK error('\nUnicodeDecodeError while processing traceback.\n') return None except: # FIXME: I've been getting many crash reports from python 2.3 # users, traceable to inspect.py. If I can find a small test-case # to reproduce this, I should either write a better workaround or # file a bug report against inspect (if that's the real problem). # So far, I haven't been able to find an isolated example to # reproduce the problem. inspect_error() traceback.print_exc(file=self.ostream) info('\nUnfortunately, your original traceback can not be constructed.\n') return None
def load_experiment_config_file(): # Load the config file, this holds information about data, black box fn etc. try: cfg_filename = "config.cfg" config = SafeConfigParser(allow_no_value=True) config.read(cfg_filename) if not config.has_option("HPOLIB", "is_not_original_config_file"): logger.critical("Config file in directory %s seems to be an" " original config which was not created by wrapping.py. " "Are you sure that you are in the right directory?" % os.getcwd()) sys.exit(1) return config except IOError as e: logger.critical("Could not open config file in directory %s", os.getcwd()) sys.exit(1)
def get_records(self, etb, number_of_lines_of_context, tb_offset): try: # Try the default getinnerframes and Alex's: Alex's fixes some # problems, but it generates empty tracebacks for console errors # (5 blanks lines) where none should be returned. return _fixed_getinnerframes(etb, number_of_lines_of_context, tb_offset) except: # FIXME: I've been getting many crash reports from python 2.3 # users, traceable to inspect.py. If I can find a small test-case # to reproduce this, I should either write a better workaround or # file a bug report against inspect (if that's the real problem). # So far, I haven't been able to find an isolated example to # reproduce the problem. inspect_error() traceback.print_exc(file=self.ostream) info('\nUnfortunately, your original traceback can not be constructed.\n') return None
def _fixed_getinnerframes(etb, context=1, tb_offset=0): LNUM_POS, LINES_POS, INDEX_POS = 2, 4, 5 records = fix_frame_records_filenames(inspect.getinnerframes(etb, context)) # If the error is at the console, don't build any context, since it would # otherwise produce 5 blank lines printed out (there is no file at the # console) rec_check = records[tb_offset:] try: rname = rec_check[0][1] if rname == '<ipython console>' or rname.endswith('<string>'): return rec_check except IndexError: pass aux = traceback.extract_tb(etb) assert len(records) == len(aux) for i, (file, lnum, _, _) in enumerate(aux): maybeStart = lnum - 1 - context // 2 start = max(maybeStart, 0) end = start + context lines = linecache.getlines(file)[start:end] buf = list(records[i]) buf[LNUM_POS] = lnum buf[INDEX_POS] = lnum - 1 - start buf[LINES_POS] = lines records[i] = tuple(buf) return records[tb_offset:] # Helper function -- largely belongs to VerboseTB, but we need the same # functionality to produce a pseudo verbose TB for SyntaxErrors, so that they # can be recognized properly by ipython.el's py-traceback-line-re # (SyntaxErrors have to be treated specially because they have no traceback)
def _format_list(self, extracted_list): """Format a list of traceback entry tuples for printing. Given a list of tuples as returned by extract_tb() or extract_stack(), return a list of strings ready for printing. Each string in the resulting list corresponds to the item with the same index in the argument list. Each string ends in a newline; the strings may contain internal newlines as well, for those items whose source text line is not None. Lifted almost verbatim from traceback.py """ Colors = self.Colors list = [] for filename, lineno, name, line in extracted_list[:-1]: item = ' File %s"%s"%s, line %s%d%s, in %s%s%s\n' % \ (Colors.filename, filename, Colors.Normal, Colors.lineno, lineno, Colors.Normal, Colors.name, name, Colors.Normal) if line: item += ' %s\n' % line.strip() list.append(item) # Emphasize the last entry filename, lineno, name, line = extracted_list[-1] item = '%s File %s"%s"%s, line %s%d%s, in %s%s%s%s\n' % \ (Colors.normalEm, Colors.filenameEm, filename, Colors.normalEm, Colors.linenoEm, lineno, Colors.normalEm, Colors.nameEm, name, Colors.normalEm, Colors.Normal) if line: item += '%s %s%s\n' % (Colors.line, line.strip(), Colors.Normal) list.append(item) return list
def _some_str(self, value): # Lifted from traceback.py try: return py3compat.cast_unicode(str(value)) except: return u'<unprintable %s object>' % type(value).__name__ #----------------------------------------------------------------------------
def format_traceback(exc_info): traceback_template = '''Traceback (most recent call last): File "%(filename)s", line %(lineno)s, in %(name)s %(type)s: %(message)s\n''' # Skipping the "actual line" item # Also note: we don't walk all the way through the frame stack in this example # see hg.python.org/cpython/file/8dffb76faacc/Lib/traceback.py#l280 # (Imagine if the 1/0, below, were replaced by a call to test() which did 1/0.) exc_type, exc_value, exc_traceback = exc_info # most recent (if any) by default ''' Reason this _can_ be bad: If an (unhandled) exception happens AFTER this, or if we do not delete the labels on (not much) older versions of Py, the reference we created can linger. traceback.format_exc/print_exc do this very thing, BUT note this creates a temp scope within the function. ''' traceback_details = { 'filename': exc_traceback.tb_frame.f_code.co_filename, 'lineno' : exc_traceback.tb_lineno, 'name' : exc_traceback.tb_frame.f_code.co_name, 'type' : exc_type.__name__, 'message' : exc_value.message, # or see traceback._some_str() } del(exc_type, exc_value, exc_traceback) # So we don't leave our local labels/objects dangling # This still isn't "completely safe", though! # "Best (recommended) practice: replace all exc_type, exc_value, exc_traceback # with sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2] return "\n" + traceback.format_exc() + "\n\n" + traceback_template % traceback_details + "\n\n"
def _fixed_getinnerframes(etb, context=1, tb_offset=0): LNUM_POS, LINES_POS, INDEX_POS = 2, 4, 5 records = fix_frame_records_filenames(inspect.getinnerframes(etb, context)) # If the error is at the console, don't build any context, since it would # otherwise produce 5 blank lines printed out (there is no file at the # console) rec_check = records[tb_offset:] try: rname = rec_check[0][1] if rname == '<ipython console>' or rname.endswith('<string>'): return rec_check except IndexError: pass aux = traceback.extract_tb(etb) assert len(records) == len(aux) for i, (file, lnum, _, _) in zip(range(len(records)), aux): maybeStart = lnum - 1 - context // 2 start = max(maybeStart, 0) end = start + context lines = ulinecache.getlines(file)[start:end] buf = list(records[i]) buf[LNUM_POS] = lnum buf[INDEX_POS] = lnum - 1 - start buf[LINES_POS] = lines records[i] = tuple(buf) return records[tb_offset:] # Helper function -- largely belongs to VerboseTB, but we need the same # functionality to produce a pseudo verbose TB for SyntaxErrors, so that they # can be recognized properly by ipython.el's py-traceback-line-re # (SyntaxErrors have to be treated specially because they have no traceback)
def _format_list(self, extracted_list): """Format a list of traceback entry tuples for printing. Given a list of tuples as returned by extract_tb() or extract_stack(), return a list of strings ready for printing. Each string in the resulting list corresponds to the item with the same index in the argument list. Each string ends in a newline; the strings may contain internal newlines as well, for those items whose source text line is not None. Lifted almost verbatim from traceback.py """ Colors = self.Colors list = [] for filename, lineno, name, line in extracted_list[:-1]: item = ' File %s"%s"%s, line %s%d%s, in %s%s%s\n' % \ (Colors.filename, py3compat.cast_unicode_py2(filename, "utf-8"), Colors.Normal, Colors.lineno, lineno, Colors.Normal, Colors.name, py3compat.cast_unicode_py2(name, "utf-8"), Colors.Normal) if line: item += ' %s\n' % line.strip() list.append(item) # Emphasize the last entry filename, lineno, name, line = extracted_list[-1] item = '%s File %s"%s"%s, line %s%d%s, in %s%s%s%s\n' % \ (Colors.normalEm, Colors.filenameEm, py3compat.cast_unicode_py2(filename, "utf-8"), Colors.normalEm, Colors.linenoEm, lineno, Colors.normalEm, Colors.nameEm, py3compat.cast_unicode_py2(name, "utf-8"), Colors.normalEm, Colors.Normal) if line: item += '%s %s%s\n' % (Colors.line, line.strip(), Colors.Normal) list.append(item) return list
