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Irregular warning, sometimes prints sometimes not without changing anything in code. Didn't occur in3.3.4. It's also thrown after running an entirely different cell or file, if not restarting kernel first.
conda install --conda-forge matplotlib 3.4.3, backendmodule://ipykernel.pylab.backend_inline (Spyder), Windows 10, Python 3.7.9
D:\Anaconda\envs\pyt\lib\site-packages\matplotlib\animation.py:974: UserWarning: Animation was deleted without rendering anything. This is most likely unintended. To prevent deletion, assign the Animation to a variable that exists for as long as you need the Animation. 'Animation was deleted without rendering anything. This is 'importmatplotlib.pyplotaspltimportmatplotlib.animationasanimationclassAnimation(animation.TimedAnimation):def__init__(self):fig=plt.figure()fig.add_subplot(2,2,1)animation.TimedAnimation.__init__(self,fig,blit=True)def_draw_frame(self,frame_idx):passdefnew_frame_seq(self):returniter(range(2))ani=Animation()ani.save('test.mp4')