[issue12215] TextIOWrapper: issues with interlaced read-write

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

textiowrapper_interlaced_read_write.patch: TextIOWrapper.write() calls self.seek(self.tell()) if it has a decoder or if snapshot is not None.

I suppose that we can do better, but at least it does fix this issue.

"read(); write(); write()" only calls self.seek(self.tell()) once, at the first write. So I don't think that it changes anything with performances.

In which case snapshot can be not different than None, whereas decoder is None?

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keywords: +patch
Added file: http://bugs.python.org/file22192/textiowrapper_interlaced_read_write.patch

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