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#6513: fix example code: warning categories are classes, not instances.
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@ -204,7 +204,7 @@ check::
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fxn()
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# Verify some things
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assert len(w) == 1
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assert isinstance(w[-1].category, DeprecationWarning)
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assert issubclass(w[-1].category, DeprecationWarning)
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assert "deprecated" in str(w[-1].message)
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One can also cause all warnings to be exceptions by using ``error`` instead of
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