[issue29190] Avoid possible errors in comparing strings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

An alternative patch checks the result of PyUnicode_Compare() (as Xiang suggested) instead of checking the value before calling PyUnicode_Compare(). Stephan, what way do you prefer?

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nosy: +facundobatista, mark.dickinson, rhettinger, skrah
Added file: http://bugs.python.org/file46186/unicode_compare_2.patch

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