[Python] How to change border width of a matplotlib graph

How do I change the border width of a subplot?

Code is as follows:

fig = plt.figure(figsize = (4.1, 2.2))
ax = fig.add_subplot(111)

ax.patch.set_linewidth(0.1)
ax.get_frame().set_linewidth(0.1)


The last two lines do not work, but the following works fine:

legend.get_frame().set_ linewidth(0.1)

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