How to fix matplotlib .ylabel() AttributeError: 'AxesSubplot' object has no attribute 'ylabel'

Problem:

You want to set the ylabel of a matplotlib plot using .ylabel("My ylabel") but you see an error messsage like

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-12-28a87d95bccc> in <module>
---> 11 axs[0].ylabel("My ylabel")

AttributeError: 'AxesSubplot' object has no attribute 'ylabel'

Solution:

Use .set_ylabel("My ylabel") instead of .ylabel("My ylabel") !

While

from matplotlib import pyplot as plt

plt.ylabel("My ylabel")

works fine, if you have an axes object like the one you get from plt.subplots(), you’ll have to use set_ylabel()!

from matplotlib import pyplot as plt
fig, axs = plt.subplots(2, 1)
# ...
axs[0].set_ylabel("My ylabel")