[issue1675] Race condition in os.makedirs

[Isaac Morland]

Isaac Morland added the comment:

Yes, I'm really combining two things here - the race condition, which I
argue is a (minor) bug, and a feature request to be able to "ensure
exists" a directory.

I have not produced a proper Python patch before and I have other things
to do so this will take longer than one might hope, but I would be happy
to create a patch.  Note too that the file I uploaded is from my
project; I will attempt to make the patch be more appropriate for the
standard library than an extract from my project.

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