| # copied from python-2.7.3's traceback.py |
| # CHANGES: |
| # - some_str is replaced, trying to create unicode strings |
| # |
| import types |
| |
| def format_exception_only(etype, value): |
| """Format the exception part of a traceback. |
| |
| The arguments are the exception type and value such as given by |
| sys.last_type and sys.last_value. The return value is a list of |
| strings, each ending in a newline. |
| |
| Normally, the list contains a single string; however, for |
| SyntaxError exceptions, it contains several lines that (when |
| printed) display detailed information about where the syntax |
| error occurred. |
| |
| The message indicating which exception occurred is always the last |
| string in the list. |
| |
| """ |
| |
| # An instance should not have a meaningful value parameter, but |
| # sometimes does, particularly for string exceptions, such as |
| # >>> raise string1, string2 # deprecated |
| # |
| # Clear these out first because issubtype(string1, SyntaxError) |
| # would throw another exception and mask the original problem. |
| if (isinstance(etype, BaseException) or |
| isinstance(etype, types.InstanceType) or |
| etype is None or type(etype) is str): |
| return [_format_final_exc_line(etype, value)] |
| |
| stype = etype.__name__ |
| |
| if not issubclass(etype, SyntaxError): |
| return [_format_final_exc_line(stype, value)] |
| |
| # It was a syntax error; show exactly where the problem was found. |
| lines = [] |
| try: |
| msg, (filename, lineno, offset, badline) = value.args |
| except Exception: |
| pass |
| else: |
| filename = filename or "<string>" |
| lines.append(' File "%s", line %d\n' % (filename, lineno)) |
| if badline is not None: |
| lines.append(' %s\n' % badline.strip()) |
| if offset is not None: |
| caretspace = badline.rstrip('\n')[:offset].lstrip() |
| # non-space whitespace (likes tabs) must be kept for alignment |
| caretspace = ((c.isspace() and c or ' ') for c in caretspace) |
| # only three spaces to account for offset1 == pos 0 |
| lines.append(' %s^\n' % ''.join(caretspace)) |
| value = msg |
| |
| lines.append(_format_final_exc_line(stype, value)) |
| return lines |
| |
| def _format_final_exc_line(etype, value): |
| """Return a list of a single line -- normal case for format_exception_only""" |
| valuestr = _some_str(value) |
| if value is None or not valuestr: |
| line = "%s\n" % etype |
| else: |
| line = "%s: %s\n" % (etype, valuestr) |
| return line |
| |
| def _some_str(value): |
| try: |
| return unicode(value) |
| except Exception: |
| try: |
| return str(value) |
| except Exception: |
| pass |
| return '<unprintable %s object>' % type(value).__name__ |
