[issue1578269] Add os.link() and os.symlink() and os.path.islink() support for Windows

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

The problem I'm encountering now is tests for posixpath.realpath are
failing on Windows. These tests were previously skipped under Windows
because there was no os.symlink. Now that Windows has os.symlink, these
regression tests fail (test_realpath_basic,
test_realpath_resolve_before_normalizing, test_realpath_resolve_first,
and test_realpath_resolve_parent).

What is the correct fix for this? Should posixpath.realpath work on
Windows? If not, should the tests just be ignored under Windows?
Otherwise, should posixpath.realpath be rewritten to be robust under
both operating systems? Or is there another approach?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1578269>
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