How to clear memory completely of all matplotlib plots

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Especially when you are running multiple processes or threads, it is much better to define your figure variable and work with it directly:

from matplotlib import pyplot as plt

f = plt.figure()
f.clear()
plt.close(f)

In any case, you must combine the use of plt.clear() and plt.close()

UPDATE (2021/01/21)

If you are using a MacOS system along with its default backend (referred as ‘MacOSX’), this does NOT work (at least in Big Sur). The only solution I have found is to switch to other of the well-known backends, such as TkAgg, Cairo, etc. To do it, just type:

import matplotlib
matplotlib.use('TkAgg') # Your favorite interactive or non-interactive backend

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