[issue15414] os.path.join behavior on Windows (ntpath.join) is unexpected and not well documented

[Dave Sawyer]

Dave Sawyer added the comment:

http://bugs.python.org/issue1669539 has been partially fixed. On Windows os.path.join('foo', 'a:bar') gives 'a:bar' not 'foo\\a:bar'. However os.path.isabs('a:bar') returns False yet it causes a reset in the join like an absolute path.

'\foo' is considered an absolute path even though calling os.path.abspath on it can yield different results - as if it were a relative path. At minimum we should amend the wording about what resets the join.

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nosy: +dsawyer

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<http://bugs.python.org/issue15414>
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