Antoine Pitrou <pit...@free.fr> added the comment:

Oh, forgot to mention, the term "symlink loop" itself is ambiguous.

There are direct symlink loops: an example is a "some_dir/linky" link pointing 
to "../some_dir/linky". These will fail when resolving them.

There are indirect symlink loops: "some_dir/linky" pointing to "../some_dir". 
Resolving them works fine, but recursively walking them produces an infinite 
recursion.

Lots of fun :)

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<http://bugs.python.org/issue13229>
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