Replace warnings.warn with cbook._warn_external or logging.warning#12006

Merged

timhoffm merged 1 commit intomatplotlib:masterfrom

hershen:add-stacklevel-to-warnings-fixes-issue-10643

Oct 29, 2018

Commits on Oct 29, 2018

1) Replaced warnings.warn with either logging.warnings or cbook._warn_external.
hershen
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