[issue4121] open(): use keyword only for arguments other than file and mode

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


Added file: http://bugs.python.org/file11785/explicit_open-fixtests.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4121>
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