Fix a bug in traceback.format_exception_only() that led to an error
being raised when print_exc() was called without an exception set. In version 2.4, this printed "None", restored that behavior.
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@ -149,6 +149,10 @@ def test():
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str_value = '<unprintable %s object>' % X.__name__
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self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
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def test_without_exception(self):
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err = traceback.format_exception_only(None, None)
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self.assertEqual(err, ['None\n'])
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def test_main():
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run_unittest(TracebackCases)
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@ -170,7 +170,7 @@ def format_exception_only(etype, value):
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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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type(etype) is str):
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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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@ -56,6 +56,10 @@ Core and builtins
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Library
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-------
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- Fix a bug in traceback.format_exception_only() that led to an error
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being raised when print_exc() was called without an exception set.
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In version 2.4, this printed "None", restored that behavior.
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- Make webbrowser.BackgroundBrowser usable in Windows (it wasn't because
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the close_fds arg to subprocess.Popen is not supported).
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