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pip execution fails and the recovery

I got following error from pip.

$ pip
Traceback (most recent call last):
  File "/usr/local/bin/pip", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in <module>
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    raise DistributionNotFound(req)  # XXX put more info here
pkg_resources.DistributionNotFound: pip==1.4.1

There is a way to fix in a thread of StackOverflow.

easy_install --upgrade pip

I've remembered I has installed it with the installer, https://raw.github.com/pypa/pip/master/contrib/get-pip.py, but it seemed my misunderstanding. I've never installed pip on this machine which I got recently and upgraded to Mavericks.

Anyway, the command fixed the issue :)