Using pyinstaller on parmap causes a tkinter matplotlib import error. Why?

Question

Update

If I try downgrading from Pyinstaller 3.2 to 3.1 I instead get the following traceback when I try to run the executable.

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Answer 1

Repiklis provided the solution in the comments. Further note that as of January 15 2017 Pyinstaller version 3.2.1 was released. I now use this and it solves this issue along with others like this and this that I could previously only solve by using the developer version. So I highly recommend upgrading to the latest version if you haven't already.