Ned Batchelder 7d964b12db Context managers need to clean up properly ...

An @contextmanager will raise an exception from its yield statement if
an exception happens in the with-block that uses it.  If the context
manager needs to do clean up, it should do it even if an exception is
raised, so it needs to be done in a finally clause.

2019-04-17 13:14:48 -04:00

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