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Merge: #22797: clarify when URLErrors are raised by urlopen.
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@ -83,7 +83,7 @@ The :mod:`urllib.request` module defines the following functions:
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:class:`URLopener` and :class:`FancyURLopener` classes, this function
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returns a :class:`urllib.response.addinfourl` object.
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Raises :exc:`~urllib.error.URLError` on errors.
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Raises :exc:`~urllib.error.URLError` on protocol errors.
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Note that ``None`` may be returned if no handler handles the request (though
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the default installed global :class:`OpenerDirector` uses
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