86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
# copied from python-2.7.3's traceback.py
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# CHANGES:
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# - some_str is replaced, trying to create unicode strings
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#
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from __future__ import absolute_import, division, print_function
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import types
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def format_exception_only(etype, value):
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"""Format the exception part of a traceback.
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The arguments are the exception type and value such as given by
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sys.last_type and sys.last_value. The return value is a list of
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strings, each ending in a newline.
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Normally, the list contains a single string; however, for
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SyntaxError exceptions, it contains several lines that (when
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printed) display detailed information about where the syntax
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error occurred.
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The message indicating which exception occurred is always the last
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string in the list.
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"""
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# An instance should not have a meaningful value parameter, but
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# sometimes does, particularly for string exceptions, such as
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# >>> raise string1, string2 # deprecated
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#
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# Clear these out first because issubtype(string1, SyntaxError)
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# would throw another exception and mask the original problem.
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if (isinstance(etype, BaseException) or
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isinstance(etype, types.InstanceType) or
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etype is None or type(etype) is str):
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return [_format_final_exc_line(etype, value)]
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stype = etype.__name__
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if not issubclass(etype, SyntaxError):
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return [_format_final_exc_line(stype, value)]
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# It was a syntax error; show exactly where the problem was found.
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lines = []
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try:
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msg, (filename, lineno, offset, badline) = value.args
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except Exception:
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pass
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else:
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filename = filename or "<string>"
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lines.append(' File "%s", line %d\n' % (filename, lineno))
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if badline is not None:
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if isinstance(badline, bytes): # python 2 only
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badline = badline.decode('utf-8', 'replace')
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lines.append(u' %s\n' % badline.strip())
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if offset is not None:
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caretspace = badline.rstrip('\n')[:offset].lstrip()
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# non-space whitespace (likes tabs) must be kept for alignment
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caretspace = ((c.isspace() and c or ' ') for c in caretspace)
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# only three spaces to account for offset1 == pos 0
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lines.append(' %s^\n' % ''.join(caretspace))
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value = msg
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lines.append(_format_final_exc_line(stype, value))
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return lines
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def _format_final_exc_line(etype, value):
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"""Return a list of a single line -- normal case for format_exception_only"""
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valuestr = _some_str(value)
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if value is None or not valuestr:
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line = "%s\n" % etype
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else:
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line = "%s: %s\n" % (etype, valuestr)
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return line
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def _some_str(value):
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try:
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return unicode(value)
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except Exception:
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try:
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return str(value)
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except Exception:
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pass
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return '<unprintable %s object>' % type(value).__name__
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