在Python中，如何将警告视为异常？

在Python中，如何将警告视为异常？

引用python手册（27.6.4。Testing
Warnings
）：

import warningsdef fxn():    warnings.warn("deprecated", DeprecationWarning)with warnings.catch_warnings(record=True) as w:    # Cause all warnings to always be triggered.    warnings.simplefilter("always")    # Trigger a warning.    fxn()    # Verify some things    assert len(w) == 1    assert issubclass(w[-1].category, DeprecationWarning)    assert "deprecated" in str(w[-1].message)