[issue9299] os.mkdir() and os.makedirs() add a keyword argument to suppress "File exists" exception.

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

Agree! Sure, the functions in os are mainly to simulate the system call but not the system command. This seems like a good suggestion.

So here is the new patch which leave posixmodule.c alone and just wrappers os.mkdir() with try...except... in os.makedirs().

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Added file: http://bugs.python.org/file18120/mkdir_py3k.diff

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