Pip phply install error

# sudo pip install phply==0.9.1
Downloading/unpacking phply==0.9.1
  Running setup.py egg_info for package phply

Requirement already satisfied (use --upgrade to upgrade): ply in /usr/local/lib/python2.7/dist-packages (from phply==0.9.1)
Installing collected packages: phply
  Found existing installation: phply dev
    Can't uninstall 'phply'. No files were found to uninstall.
  Running setup.py install for phply

    Skipping installation of /usr/local/lib/python2.7/dist-packages/phply/__init__.py (namespace package)
    Installing /usr/local/lib/python2.7/dist-packages/phply-0.9.1-nspkg.pth
Successfully installed phply
Cleaning up...