STINNER Victor added the comment:

You can actually specify permission:

fd = os.open("document.txt", os.O_WRONLY | os.O_CREAT, 0o777)
fp = open(fd, "wb")
with fp:
   ...

You can also use the dir_fd parameter for even better security ;-)

Is your request for the standard open() function, rather than os.open()?

Note: io.FileIO(), the underlying object when calling the Python open(), calls 
the C open() function with 0o666 for the permission mode.

----------
nosy: +haypo

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29214>
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