[docs] [issue12760] Add create mode to open()

[David Townshend]

David Townshend <aquavitae69 at gmail.com> added the comment:

It is already possible to write a wrapper function that does it:

def create(file):
    fd = os.open(file, os.O_EXCL | os.O_CREAT | os.O_WRONLY)
    return os.fdopen(fd)

The point it not that it can't be done, but that it is not straight forward.  The docs say this about os.open(): "This function is intended for low-level I/O. For normal usage, use the built-in function open()" 

I wouldn't call creating a new file low-level I/O, but it is normal usage.

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