Python 3 pickle error

[dmdm]

I had installed yolk in a Python 3.2 virtualenv. Querying cheeseshop for a name, e.g.
yolk -S name=couch
results in this error:
File "/home/dm/myprojects/python3-env/lib/python3.2/site-packages/yolk/pypi.py", line 179, in query_cached_package_list
return pickle.load(open(self.pkg_cache_file, "r"))
TypeError: 'str' does not support the buffer interface

Solution:
Docs for pickle.load() state, file must return bytes. Saying "rb" instead of "r" for open() seems to do the trick, Similarly, in line 185 say "wb" instead of "w".

[myint]

This is fixed in issue #13.