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gh-143445: Optimize deepcopy for 1.04x speedup #143449

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Merged
vstinner merged 2 commits into from
Jan 8, 2026
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gh-143445: Optimize deepcopy for 1.04x speedup #143449

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35c3168
Optimize deepcopy for 1.04x speedup
heikkitoivonen Jan 5, 2026
ef2d3ea
Update Misc/NEWS.d/next/Library/2026-01-05-12-20-42.gh-issue-143445.r…
heikkitoivonen Jan 5, 2026
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Optimize deepcopy for 1.04x speedup 
Gains according to pyperformance:
```
deepcopy:
Mean +- std dev: 411 us +- 2 us -> 396 us +- 3 us: 1.04x faster
Significant (t=28.94)

deepcopy_reduce:
Mean +- std dev: 4.38 us +- 0.05 us -> 4.23 us +- 0.04 us: 1.04x faster
Significant (t=20.05)
```
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heikkitoivonen committed Jan 5, 2026
commit 35c3168b82f87cb55a7165f6e7ecc50152d05b67
2 changes: 1 addition & 1 deletion Lib/copy.py
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Expand Up @@ -230,7 +230,7 @@ def _reconstruct(x, memo, func, args,
*, deepcopy=deepcopy):
deep = memo is not None
if deep and args:
args = (deepcopy(arg, memo) for arg in args)
args = [deepcopy(arg, memo) for arg in args]
y = func(*args)
if deep:
memo[id(x)] = y
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1 change: 1 addition & 0 deletions Misc/ACKS
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Expand Up @@ -1931,6 +1931,7 @@ James Tocknell
Bennett Todd
R Lindsay Todd
Eugene Toder
Heikki Toivonen
Erik Tollerud
Stephen Tonkin
Matias Torchinsky
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-01-05-12-20-42.gh-issue-143445.rgxnbL.rst
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@@ -0,0 +1 @@
Optimize deepcopy in :mod:`copy`, pyperformance reports 1.04x speedup.
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