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gh-129813, PEP 782: Use PyBytesWriter in _io.FileIO.readall - #138901
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vstinner merged 3 commits intoSep 15, 2025
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Performance about the same, using the benchmark from pythongh-120754: ``` pyperf compare_to main.json pep782.json read_file_small: Mean +- std dev: [main] 5.71 us +- 0.05 us -> [pep782] 5.68 us +- 0.05 us: 1.01x faster read_file_large: Mean +- std dev: [main] 89.7 us +- 0.9 us -> [pep782] 86.9 us +- 0.8 us: 1.03x faster read_all_rst_bytes: Mean +- std dev: [main] 926 us +- 8 us -> [pep782] 920 us +- 12 us: 1.01x faster read_all_rst_text: Mean +- std dev: [main] 2.24 ms +- 0.02 ms -> [pep782] 2.17 ms +- 0.04 ms: 1.03x faster Benchmark hidden because not significant (1): read_all_py_bytes Geometric mean: 1.01x faster ```
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Misc/NEWS.d/next/Library/2025-09-14-18-21-17.gh-issue-129813.XN7EyU.rst
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LGTM, but I suggest removing the NEWS entry.
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Performance largely flat, maybe faster on bm_readall.py from gh-120754 (read all python docs and py files using readall).