ImportError: Cannot load backend ‘TkAgg’ which requires the ‘tk’ interactive framework, as ‘headless’ is currently running

by

What solved the problem for me was to restart my kernel, import the following first:

import matplotlib
matplotlib.use('TKAgg')

Then,

import matplotlib.pyplot as plt

You probably imported matplotlib with another framework before you tried to change to TKAgg. Restart your kernel.

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