[issue22797] urllib.request.urlopen documentation falsely guarantees that a URLError will be raised on errors

[Roundup Robot]

Roundup Robot added the comment:

New changeset b4df20312b78 by R David Murray in branch 'default':
Clean up urlopen doc string.
https://hg.python.org/cpython/rev/b4df20312b78

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<http://bugs.python.org/issue22797>
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