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FIX: be more careful about not importing pyplot early - #17764
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In matplotlib.use we import pyplot to use `switch_backend`, however if the user calls `mpl.use(...)` before importing pyplot then during the initial import of pyplot, before we set the selected backend we try to set the backend set via rcParams. This change only imports pyplot if it is already imported, otherwise it is safe to just set the rcParams and not go through the full `plt.switch_backend` path. closes matplotlib#17763
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…764-on-v3.3.x Backport PR #17764 on branch v3.3.x (FIX: be more careful about not importing pyplot early)
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PR Summary
In matplotlib.use we import pyplot to use
switch_backend, howeverif the user calls
mpl.use(...)before importing pyplot thenduring the initial import of pyplot, before we set the selected
backend we try to set the backend set via rcParams.
This change only imports pyplot if it is already imported, otherwise
it is safe to just set the rcParams and not go through the full
plt.switch_backendpath.closes #17763
This seems difficult to test given that it is dependent on import order.
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