Hi, I've looked at what's going on, and the problem seems to be caused by the fact that distlib 0.1.9 uses PEP426 and 0.2.0 uses PEP440; the latter has an extra "epoch" field.
Because pip.util (in the version included with Debian) expects the output not to have this epoch field, it breaks. Downgrading python-distlib and python-distlib-whl to the version in testing (0.1.9) makes pip and virtualenv work again. Alternatively, updating to the latest pip (which is not yet available in Debian) would probably fix this as well. The third option would be to temporarily patch the current pip to support both versions of distlib. I've attached a patch (for pip/util.py) that seems to work. - Felix
--- util.py__BAK 2015-05-24 21:06:54.667012795 +0200
+++ util.py 2015-05-24 21:06:54.667012795 +0200
@@ -735,7 +735,10 @@
# Cannot normalize, assume it is a pre-release
return True
- parsed = version._normalized_key(normalized)
+ if version._normalized_key.__name__ == "_pep_440_key":
+ parsed = version._normalized_key(normalized)[1:]
+ else:
+ parsed = version._normalized_key(normalized)
return any([any([y in set(["a", "b", "c", "rc", "dev"]) for y in x]) for x in parsed])
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