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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

socket.makefile() already uses keyword only argument, but buffering is 
not a keyword only argument:
    def makefile(self, mode="r", buffering=None, *,
                 encoding=None, newline=None):

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