Antoine Pitrou <pit...@free.fr> added the comment:

Some micro-benchmarks:

$ ./python -m timeit "class Test: pass"
- before: 8.84 usec per loop
- after: 7.03 usec per loop

$ ./python -m timeit "class Test(tuple): pass"
- before: 10.1 usec per loop
- after: 8.4 usec per loop

$ ./python -m timeit -s "from logging import Logger" "class Test(Logger): pass"
- before: 12 usec per loop
- after: 6.25 usec per loop

$ ./python -m timeit -s "from logging.handlers import DatagramHandler" "class 
Test(DatagramHandler): pass"
- before: 15 usec per loop
- after: 6.68 usec per loop

$ ./python -m timeit -s "from unittest.mock import MagicMock" "class 
Test(MagicMock): pass"
- before: 18.2 usec per loop
- after: 6.56 usec per loop

$ ./python -m timeit -s "from shelve import Shelf" "class Test(Shelf): pass"
- before: 28.6 usec per loop
- after: 18.4 usec per loop

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32346>
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