Add border around text with matplotlib

Sometimes text labels on plots can be hidden if there is too little contrast with a background color.  You can add borders to text objects (and probably most other patches) with “PathEffects“, see also

Below is an example:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patheffects as PathEffects

plt.imshow(np.zeros((5,5), cmap=plt.gray())
txt = plt.text(2,2,'This is a test', size=11, color='black')
txt.set_path_effects([PathEffects.withStroke(linewidth=5, foreground='w')])


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