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

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +draghuram, gagenellina, gvanrossum, zooko

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9299>
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