Brett Cannon added the comment:
You need to temporarily turn on warnings for it to work. For example:
with warnings.catch_warnings():
warnings.simplefilter('always')
with self.assertWarnsRegex(DeprecationWarning, "reserved keyword"):
exec('async = 33')
Do notice I used exec() as otherwise the warning will be triggered at import
instead of when the test runs.
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<http://bugs.python.org/issue26182>
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