I've run this code many times but now it's failing. Matplotlib won't work for any example, even the most trivial. This is the error I'm getting, but I'm not sure what to make of it. I know this is vague and I can't really provide a way to reproduce it. I've uninstalled every package I recently installed and tried reinstalling matplotlib.

fig = plt.figure()ax = fig.add_subplot(1, 1, 1)plt.plot(self.I_hist)plt.show()

  File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/backends/backend_macosx.py", line 41, in _drawself.figure.draw(renderer)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/artist.py", line 73, in draw_wrapperresult = draw(artist, renderer, *args, **kwargs)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/artist.py", line 50, in draw_wrapperreturn draw(artist, renderer)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/figure.py", line 2810, in drawmimage._draw_list_compositing_images(File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/image.py", line 132, in _draw_list_compositing_imagesa.draw(renderer)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/artist.py", line 50, in draw_wrapperreturn draw(artist, renderer)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/axes/_base.py", line 3020, in drawself._unstale_viewLim()File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/axes/_base.py", line 776, in _unstale_viewLimself.autoscale_view(**{f"scale{name}": scaleFile "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/axes/_base.py", line 2932, in autoscale_viewhandle_single_axis(File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/axes/_base.py", line 2895, in handle_single_axisx0, x1 = locator.nonsingular(x0, x1)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/ticker.py", line 1654, in nonsingularreturn mtransforms.nonsingular(v0, v1, expander=.05)File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/matplotlib/transforms.py", line 2880, in nonsingularif maxabsvalue < (1e6 / tiny) * np.finfo(float).tiny:File "/Users/username/Documents/Newsvendor/venv/lib/python3.10/site-packages/numpy/core/getlimits.py", line 462, in __new__dtype = numeric.dtype(type(dtype))
TypeError: 'NoneType' object is not callable

What version of Python/ Numpy are you using?

I have the same issue with

• Python 3.10.4 (tags/v3.10.4:9d38120, Mar 23 2022, 23:13:41) [MSC v.1929 64 bit (AMD64)] on win32

• numpy==1.22.3

• PyCharm 2022.1 (Professional Edition)

>>> from numpy.core import numeric
>>> numeric.dtype(float)numeric.dtype(float)
Traceback (most recent call last):File "C:\Program Files\JetBrains\PyCharm 2022.1\plugins\python\helpers\pydev\_pydevd_bundle\pydevd_exec2.py", line 3, in Execexec(exp, global_vars, local_vars)File "<input>", line 1, in <module>
TypeError: 'NoneType' object is not callable

Apparently numeric.dtype is not defined properly. (Its value is None!) If you use np.dtype(float) that will work.

>>> import numpy as np
>>> np.dtype(float)dtype('float64')

I believe that if you SHUT OFF scientific mode in PyCharm this should work again.

Settings->Tools->Python Scientific, uncheck Show plots in tool window.

Apparently Jetbrains uses an empty numpy.core template library that breaks the numeric module. (This is an issues thats been raised in bug list but not addressed)