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Mon Jul 19 07:16:28 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-July/102067.html

Agree. Through searching for existing issues, I found there isn't any such
request. And I will submit one.

The '-p' option of shell's mkdir has tow functions:
    1, create parents directories if not exists,
    2, suppress "File exists" error if the target has already exists.
What we need is the second function. So I think both os.mkdir() and
os.makedirs() should add a keyword argument to suppress the "OSError: [Errno
17] File exists". So we can remove many "try...except..." codes surround
os.mkdir() and os.makedirs() as Greg said, "The operation of 'make sure this
directory and all its parents exist' is very commonly required"

-- 
Ray Allen
Best wishes!
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[Python-Dev] mkdir -p in python