[issue8143] urlparse has a duplicate of urllib.unquote

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

So David's right that local commits are bad from a threading perspective. If you happen to have an import trigger a thread which itself triggers an import you will lock up the interpreter. Typically this is avoided by not importing anything in a thread and not launching a thread based on an import. But some people do and they eventually get bit by calling a function that they didn't realize would trigger an import as a side-effect.

Since the code duplication has been solved in Python 3 I say add a comment about the duplication and be done with it for ease of development and complete backwards-compatibility.

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