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Working on issue #1762: Brought

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./python.exe -m timeit -s 'from fractions import Fraction; f = Fraction(3, 2)' 'isinstance(3, Fraction); isinstance(f, Fraction)'
from 12.3 usec/loop to 3.44 usec/loop and
  ./python.exe -m timeit -s 'from fractions import Fraction' 'Fraction(3, 2)'
from 48.8 usec to 23.6 usec by avoiding genexps and sets in __instancecheck__
and inlining the common case from __subclasscheck__.
This commit is contained in:
Jeffrey Yasskin 2008-02-13 17:58:04 +00:00
parent 0a40ffb1b3
commit 57bd60b465
2 changed files with 24 additions and 2 deletions
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10
Lib/test/test_abc.py
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@ -83,6 +83,16 @@ class TestABC(unittest.TestCase):
self.assertEqual(issubclass(C, A), True)
self.assertEqual(isinstance(c, A), True)
def test_isinstance_invalidation(self):
class A:
__metaclass__ = abc.ABCMeta
class B(object):
pass
b = B()
self.assertEqual(isinstance(b, A), False)
A.register(B)
self.assertEqual(isinstance(b, A), True)
def test_registration_builtins(self):
class A:
__metaclass__ = abc.ABCMeta