No module named builtins

I also found using 'pip install future' resolved this issue

I got the information from here: https://askubuntu.com/questions/697226/importerror-no-module-named-builtins

I hope this clarifies this for other users, like me who stumbled upon your question

Running pip install future fixed this error for me. For compatibility with Python2.7, the package future should be added to the install_requires in setup.py.

Note that nosetests also fails without matplotlib, but I'm not sure adding matplotlib as a dependency makes much sense.

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