pip fails with AttributeError: 'module' object has no attribute 'wraps'

Question

I'm on Fedora. I recently upgraded my system from F20 to F21. Pip was working fine on F20 but after the upgrade to F21 something must have gone wrong. Pip stopped working, every time I enter the command pip <anything> the error below occurs:

Traceback (most recent call last):
  File "/usr/bin/pip", line 7, in <module>
    from pip import main
  File "/usr/lib/python2.7/site-packages/pip/__init__.py", line 12, in <module>
    from pip.commands import commands, get_summaries, get_similar_commands
  File "/usr/lib/python2.7/site-packages/pip/commands/__init__.py", line 6, in <module>
    from pip.commands.bundle import BundleCommand
  File "/usr/lib/python2.7/site-packages/pip/commands/bundle.py", line 6, in <module>
    from pip.commands.install import InstallCommand
  File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 5, in <module>
    from pip.req import InstallRequirement, RequirementSet, parse_requirements
  File "/usr/lib/python2.7/site-packages/pip/req/__init__.py", line 3, in <module>
    from .req_install import InstallRequirement
  File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 31, in <module>
    from pip.utils import (
  File "/usr/lib/python2.7/site-packages/pip/utils/__init__.py", line 59, in <module>
    def rmtree(dir, ignore_errors=False):
  File "/usr/lib/python2.7/site-packages/pip/_vendor/retrying.py", line 47, in wrap
    @six.wraps(f)
AttributeError: 'module' object has no attribute 'wraps'

Answer 1

Okay after trying out all the solutions I could google with no result in sight. I tried to risk and play a little bit. This might not be the safest solution but it worked fine for me. Seeing that python get-pip.py resulted in:

Requirement already up-to-date: pip in /usr/lib/python2.7/site-packages

even when I had pip uninstalled. I went over to /usr/lib/python2.7/site-packages/ to find out two pip directories: pip and pip-6.0.8.dist-info. Removed both immediately. Then tried python get-pip.py again. Voila! it worked.