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gh-142407: Update shutil.rst to clarify copy performance on Windows by NewUserHa · Pull Request #142408 · python/cpython · GitHub

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gh-142407: Update shutil.rst to clarify copy performance on Windows #142408

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Merged
zooba merged 6 commits into from
Feb 5, 2026
+3 −1
Conversation 5 Commits 6 Checks 27 Files changed 1
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gh-142407: Update shutil.rst to clarify copy performance on Windows #142408

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4ee139d
Update shutil.rst to clarify Windows copy behavior
NewUserHa Dec 8, 2025
85a26e1
Fix typo in shutil.rst documentation
NewUserHa Dec 8, 2025
4920eeb
Fix formatting of shutil.copy2 documentation
NewUserHa Dec 8, 2025
fd9e178
Update Doc/library/shutil.rst
NewUserHa Dec 9, 2025
0245cee
Apply suggestion from @StanFromIreland
zooba Feb 5, 2026
81af50f
Merge branch 'main' into patch-7
StanFromIreland Feb 5, 2026
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4 changes: 3 additions & 1 deletion Doc/library/shutil.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -540,7 +540,9 @@ On Solaris :func:`os.sendfile` is used.

On Windows :func:`shutil.copyfile` uses a bigger default buffer size (1 MiB
instead of 64 KiB) and a :func:`memoryview`-based variant of
:func:`shutil.copyfileobj` is used.
:func:`shutil.copyfileobj` is used, which is still reads and writes in a loop.
:func:`shutil.copy2` uses the native ``CopyFile2`` call on Windows, which is the most
efficient method, supports copy-on-write, and preserves metadata.

If the fast-copy operation fails and no data was written in the destination
file then shutil will silently fallback on using less efficient
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