ImportError: cannot import name 'normpdf' from 'matplotlib.mlab'

[Nokimann]

'normpdf' is deprecated? So it might result in ImportError.

Just when typed from matplotlib.mlab import normpdf
it shows ImportError
I was trying to use function 'save_spectre_plot' in 'pymatgen.io.gaussian.GaussianOutput'

I expect replacing 'normpdf' in 'matplotlib' with 'norm' in 'scipy' might solve this error.
Or, downgrading 'matplotlib' version

I refered,
https://stackoverflow.com/questions/12877794/whats-the-correct-usage-of-matplotlib-mlab-normpdf

[Nokimann]

I found the official notification.

Check 'matplotlib.mlab removals' in
https://matplotlib.org/3.1.0/api/api_changes.html

And definitely, replacing just two parts:

from matplotlib.mlab import normpdf -> from scipy.stats import norm
normpdf -> norm.pdf
(All is in the source of pymatgen.io.gaussian)