[issue30264] [Windows] test_sax: Warning -- files was modified by test_sax

[STINNER Victor]

STINNER Victor added the comment:

> I made one design choice: the close() method of byte and character streams are called twice, I didn't call setByteStream(None) / setCharacterStream(None) to avoid creating an inconsistent source. If you really care, maybe we can reset the source to a new xmlreader.InputSource() object instead.

Hum, I just modified my PR one more time to replace try/finally: self._close_source() with "try/except: self._close_source(); raise", so file.close() is now only called once.

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<http://bugs.python.org/issue30264>
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