[docs] [issue9921] os.path.join('x','') behavior

[Radu Grigore]

Radu Grigore <radugrigore at gmail.com> added the comment:

Realizing I still don't know what os.join.path does, I looked at the source. The comment in posixpath.py is:

# Ignore the previous parts if a part is absolute.
# Insert a '/' unless the first part is empty or already ends in '/'.

I find this clear and it directly corresponds to the implementation.

On the other hand, the source of ntpath.join() is a nightmare, and there's no similarly simple comment there.

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