Ezio Melotti added the comment:
I think that the problem is actually with the file.write() in _show_warning().
If any of the arguments of formatwarning() are unicode, the result will be
unicode, and if "file" (default sys.stderr) is opened in binary mode, Python
will try to encode the unicode result with the ASCII codec and fail with a
UnicodeEncodeError:
>>> warnings.showwarning(u'你好', DeprecationWarning, 'foo.py', 10)
foo.py:10: DeprecationWarning: 你好
>>> with open('err.log', 'wb') as f:
... warnings.showwarning(u'你好', DeprecationWarning, 'foo.py', 10, file=f)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
File "/usr/lib/python2.7/warnings.py", line 30, in _show_warning
file.write(formatwarning(message, category, filename, lineno, line))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 31-32:
ordinal not in range(128)
----------
nosy: +ezio.melotti
resolution: -> not a bug
stage: -> resolved
status: open -> closed
type: crash -> behavior
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23637>
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