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python3Packages.piep: enable for python3
This re-enables the piep package for python3, as piep v0.10.0 (the current version) works fine with python3. The `disabled = isPy3k` line had been added for an earlier version of piep. Here, I chose not to remove the `disabled = ...` line, but to change to condition to `!isPy3k`, because https://github.com/timbertson/piep/commit/a5594a4e6a163d1ac3f7f95e1146bf4d8372344d and https://github.com/timbertson/piep/blob/9c032f593bbcb977b3b6048081bfa482dfe9a148/piep/main.py#L1 seem to indicate that piep no longer works with python2.