Originally reported by: rbtcollins (Bitbucket: rbtcollins, GitHub: rbtcollins)

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In setuptools/package_index.py

line 1040 in local_open()
files.append("%s" % (f,f))

If f is a unicode string the resulting text is:
[u"<a href=u'testbuilder-1.0.tar.gz'>testbuilder-1.0.tar.gz"]

note the href=u in the HTML, which is not valid - this leads to output like the following:
Reading file:///tmp/tmpBGlO4q/testbuilder/
Reading file:///tmp/tmpBGlO4q/testbuilder/u
No local packages or download links found for testbuilder

Using ..."%s"... in the format string should fix this - I'm not 100% sure why filename is ending up unicode for me, but there it is

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/471