Christian Heimes added the comment:
__instancecheck__ contains unnecessary code. If we restrict ABCs to new
style classes we could make the function faster:
Old:
def __instancecheck__(cls, instance):
"""Override for isinstance(instance, cls)."""
return any(cls.__subclasscheck__(c)
for c in {instance.__class__, type(instance)})
New:
def __instancecheck__(cls, instance):
"""Override for isinstance(instance, cls)."""
# safe a function call for common case
if instance.__class__ in cls._abc_cache:
return True
return cls.__subclasscheck__(instance.__class__)
----------
assignee: -> gvanrossum
nosy: +gvanrossum
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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue1762>
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