I wasn’t going to say anything because I haven’t used MS Windows for years.
The OP wants to add a path separator at the end of a path. Why the OP wants to
do that doesn’t concern me.
OTOH, as others have already mentioned, the documentation explicitly says, "If
a component is an absolute path, all previous components are thrown away and
joining continues from the absolute path component.” While I may not
understand WHY anyone would want that to occur, this was the way it was
designed; it is not a bug.
The documentation also says, “The return value is the concatenation of path and
any members of *paths with exactly one directory separator (os.sep) following
each non-empty part except the last, meaning that the result will only end in a
separator if the last part is empty.” So, the module does allow one to add a
path separator at the end of the path by simply adding an empty string as the
last part of the path. The following is on macOS (I don’t have a MS Windows
machine):
>>> import os.path
>>> os.path.join('/Users/myID/a', 'b','c')
'/Users/myID/a/b/c'
>>> os.path.join('/Users/myID/a', 'b','c', '')
'/Users/myID/a/b/c/‘
So, it does work as advertised on Python 3.8 and all the OP should need to do
is add that empty string to get the OP’s desired result.
Bev in TX
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