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bpo-37651: Document CancelledError is now a subclass of BaseException (


Automerge-Triggered-By: @1st1
(cherry picked from commit 7b69069)

Co-authored-by: Xtreak <>
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miss-islington and tirkarthi committed Sep 11, 2019
1 parent aa52717 commit e784bb7c6b2a52e80d7c03cb85e5faab11a1ccbd
Showing with 2 additions and 19 deletions.
  1. +2 −19 Doc/library/asyncio-exceptions.rst
@@ -25,26 +25,9 @@ Exceptions
when asyncio Tasks are cancelled. In almost all situations the when asyncio Tasks are cancelled. In almost all situations the
exception must be re-raised. exception must be re-raised.

.. important:: .. versionchanged:: 3.8

This exception is a subclass of :exc:`Exception`, so it can be
accidentally suppressed by an overly broad ``try..except`` block::

await operation
except Exception:
# The cancellation is broken because the *except* block
# suppresses the CancelledError exception.
log.log('an error has occurred')

Instead, the following pattern should be used::

try: :exc:`CancelledError` is now a subclass of :class:`BaseException`.
await operation
except asyncio.CancelledError:
except Exception:
log.log('an error has occurred')

.. exception:: InvalidStateError .. exception:: InvalidStateError

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