import matplotlib failing with No module named _tkinter on heroku [duplicate]

Question

I'm trying to use matplotlib in my application. I created a virtualenv in python2.7, pip installed matplotlib, and it's successfully running on local.

However, when I deploy the app to heroku (after pip freeze and other steps necessary), my app crashes. When I check the log, I see the following:

import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named _tkinter

It's weird because the app was successfully running on local under venv. Is the heroku python environment not configured to run matplotlib? If so, what steps should I take to enable that?

Suppose you were to use matplotlib.show in the code. Where would you expect the figure to show up? On a monitor at the server farm? (Why would there be one in the first place?) In the user's web browser? (How should it translate from a GUI window into HTML?) Something else? — Karl Knechtel
– Karl Knechtel, Commented Apr 26, 2023 at 19:57

Ahmed Haque · Accepted Answer · 2017-01-02 18:09:06Z

11

This should do the trick

matplotlib.use('Agg')
import matplotlib.pyplot as plt

This will set your Matplotlib backend to use Agg instead of Tk. Just worked for me at least :-)

answered Jan 2, 2017 at 18:09

Ahmed Haque

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2 Comments

AruniRC Over a year ago

for sake of correctness, import matplotlib before anything else.

mobeets Over a year ago

Also, you need to make sure to put this line before any other packages that might also be importing matplotlib, e.g., skimage

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