[issue9299] os.makedirs(): Add a keyword argument to suppress "File exists" exception

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

If I understand, this makes the change minimal: exist_ok means that if *name* already exists as a directory with the specified permissions, then do not raise an error. OK with me. Make sure doc and doc string say something like that.

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