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gh-129813, PEP 782: Use PyBytesWriter in FileIO.read() - #138955
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vstinner merged 1 commit intoSep 15, 2025
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Replace PyBytes_FromStringAndSize(NULL, size) and _PyBytes_Resize() with the new public PyBytesWriter API.
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Benchmark: import pyperf
import os
file = open(__file__, "rb", 0)
def func():
file.seek(0)
for _ in range(100):
file.read(1)
runner = pyperf.Runner()
runner.bench_func('bench', func)
file.close()Result: Mean +- std dev: [ref] 65.8 us +- 1.0 us -> [change] 63.2 us +- 1.0 us: 1.04x faster cc @cmaloney |
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cmaloney
approved these changes
Sep 15, 2025
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Merged. Thanks for the review @cmaloney. |
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Replace PyBytes_FromStringAndSize(NULL, size) and _PyBytes_Resize() with the new public PyBytesWriter API.