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Issue #24400: Resurrect inspect.isawaitable()

Browse source 
collections.abc.Awaitable and collections.abc.Coroutine no longer
use __instancecheck__ hook to detect generator-based coroutines.

inspect.isawaitable() can be used to detect generator-based coroutines
and to distinguish them from regular generator objects.
This commit is contained in:
Yury Selivanov 2015-07-03 13:11:35 -04:00
parent 2ab5b092e5
commit fdbeb2b4b6
10 changed files with 92 additions and 39 deletions
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17
Lib/_collections_abc.py
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@ -81,22 +81,7 @@ class Hashable(metaclass=ABCMeta):
return NotImplemented
class _AwaitableMeta(ABCMeta):
def __instancecheck__(cls, instance):
# This hook is needed because we can't add
# '__await__' method to generator objects, and
# we can't register GeneratorType on Awaitable.
# NB: 0x100 = CO_ITERABLE_COROUTINE
# (We don't want to import 'inspect' module, as
# a dependency for 'collections.abc')
if (instance.__class__ is generator and
instance.gi_code.co_flags & 0x100):
return True
return super().__instancecheck__(instance)
class Awaitable(metaclass=_AwaitableMeta):
class Awaitable(metaclass=ABCMeta):
__slots__ = ()