R. David Murray added the comment: In python2, string.lowercase and string.uppercase are locale dependent. This isn't really all that useful in practice, which is why it was dropped in Python3. The proposed fix might be correct, *if* utf-8 is checked for (see, eg, Issue 6525), but...do you have any idea why this is a problem on illumos with _XOPEN_SOURCE=600 but not on any other platform (as far as we know)? It seems like it would be a bug in the platform's islower and isupper functions, which are supposed to operate on integers that fit in an unsigned char, and be locale aware, according to the standards.
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