[issue11145] '%o' % user-defined instance

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Good catch Armin! Thank you for your review.

Updated patch uses PyString_AsStringAndSize() and adds a check that result is exact str before changing it in-place.

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Added file: http://bugs.python.org/file45701/issue11145_5.patch

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