pip broke. how to fix DistributionNotFound error?

I find this problem in my MacBook, the reason is because as @Stephan said, I use easy_install to install pip, and the mixture of both py package manage tools led to the pkg_resources.DistributionNotFound problem.
The resolve is:

easy_install --upgrade pip

Remember: just use one of the above tools to manage your Py packages.

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