Matplotlib bar graph not drawing borders/edges

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Unfortunately, this is a bug in matplotlib 2.1. It is fixed in matplotlib version 2.2.

As of now a workaround is to set the edgecolor and linewidth for each bar individually:

import matplotlib.pyplot as plt

bars = plt.bar(range(4), [3,4,1,5])
for bar in bars:
    bar.set_edgecolor("green")
    bar.set_linewidth(20)

plt.show()

enter image description here

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