[issue18543] urllib.parse.urlopen shouldn't ignore installed opener when called with any ca* argument

[David Ford (FirefighterBlu3)]

David Ford (FirefighterBlu3) added the comment:

can we get a review on this please? i'd love to move forward and get the fixes in place.

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versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18543>
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