What does "has no metadata" mean in a yolk package listing?

Question

After setting up a simple virtualenv and installing a few packages, when I yolk -l I get

Python          - 2.7.5        - active development (/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload)
ipython         - 1.1.0        - active 
pip 1.5 has no metadata
readline        - 6.2.4.1      - active 
setuptools 2.1 has no metadata
wsgiref         - 0.1.2        - active development (/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7)
yolk            - 0.4.3        - active 

What does "has no metadata" mean for pip and setuptools (both, I believe, installed when the virtualenv is created)? Can I do something (e.g. with pip) to "fix" this?

Answer 1

Some (newer) Python packages store their package metadata in a different file than expected by yolk; yolk3k will knows how to handle that though. Just

pip install --upgrade yolk3k