Eryk Sun <> added the comment:

Note that the implementation of relpath is pure and thus assumes it's working 
with existing, resolved paths (i.e. "the filesystem is not accessed to confirm 
the existence or nature of path or start"). For example:

    >>> os.path.relpath('/some/thing', '/symlink')

If "symlink" targets "/spam/eggs/foo", then the resolved path would be 
"/spam/eggs/some/thing" instead of "/some/thing". Maybe the relative_to method 
should default to a `strict` mode that raises ValueError on ambiguous cases 
that depend on the "existence or nature" of the paths. I think the current 
implementation is strict.

nosy: +eryksun

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