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Title: gh-102213: Optimizing the Performance of __getattr__ #102213 by wangxiang-hz · Pull Request #102248 · python/cpython · GitHub

Open Graph Title: gh-102213: Optimizing the Performance of __getattr__ #102213 by wangxiang-hz · Pull Request #102248 · python/cpython

X Title: gh-102213: Optimizing the Performance of __getattr__ #102213 by wangxiang-hz · Pull Request #102248 · python/cpython

Description: when __getattr__ is defined, python with try to find an attribute using _PyObject_GenericGetAttrWithDict. Find nothing is reasonable so we don't need an exception, it will hurt performance. Using this test code: import time import sys NUM = 1000000 class AttrObj(object): def __init__(self) -> None: super(AttrObj, self).__init__() self.pps = 2 def __getattr__(self, name): return 4 def main(): start = time.time() for i in range(1, NUM): pass end = time.time() peer = end - start o = AttrObj() print(f"Python version of {sys.version}") start = time.time() for i in range(1, NUM): s = o.ppp end = time.time() print(f"Call __getattr__ spend time: {end - start - peer}") if __name__ == "__main__": main() Now the result is: Call __getattr__ spend time: 0.4704132080078125 After this modification, the result is: Call __getattr__ spend time: 0.07422256469726562 Issue: gh-102213

Open Graph Description: when __getattr__ is defined, python with try to find an attribute using _PyObject_GenericGetAttrWithDict. Find nothing is reasonable so we don't need an exception, it will hurt performance. Usi...

X Description: when __getattr__ is defined, python with try to find an attribute using _PyObject_GenericGetAttrWithDict. Find nothing is reasonable so we don't need an exception, it will hurt performance....

Opengraph URL: https://github.com/python/cpython/pull/102248

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