Backport PR #12232 on branch v3.1.x (Add helper function to check that an argument is in a list of strings.) - #13495

Backport PR #12232 on branch v3.1.x (Add helper function to check that an argument is in a list of strings.)#13495

dstansby merged 1 commit into

matplotlib:v3.1.xmatplotlib/matplotlib:v3.1.xfrom

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