[issue15280] Don't use builtins as variable names in urllib.request

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

We don’t do code cleanups for their own sake, but rather as part of a bug fix or feature addition.  Please see #15137 for a longer explanation.

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nosy: +eric.araujo, r.david.murray, terry.reedy

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