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- # 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__
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