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gh-128118: Speed up copy.copy with fast lookup for atomic and container types (#128119)

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Pieter Eendebak 2024-12-30 18:18:42 +01:00 • committed by GitHub
parent 3480124321
commit 34b85ef26c
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2 changed files with 11 additions and 18 deletions
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27
Lib/copy.py
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@ -67,13 +67,15 @@ def copy(x):
cls = type(x) cls = type(x)
copier = _copy_dispatch.get(cls) if cls in _copy_atomic_types:
if copier: return x
return copier(x) if cls in _copy_builtin_containers:
return cls.copy(x)
if issubclass(cls, type): if issubclass(cls, type):
# treat it as a regular class: # treat it as a regular class:
return _copy_immutable(x) return x
copier = getattr(cls, "__copy__", None) copier = getattr(cls, "__copy__", None)
if copier is not None: if copier is not None:
@ -98,23 +100,12 @@ def copy(x):
return _reconstruct(x, None, *rv) return _reconstruct(x, None, *rv)
_copy_dispatch = d = {} _copy_atomic_types = {types.NoneType, int, float, bool, complex, str, tuple,
def _copy_immutable(x):
return x
for t in (types.NoneType, int, float, bool, complex, str, tuple,
bytes, frozenset, type, range, slice, property, bytes, frozenset, type, range, slice, property,
types.BuiltinFunctionType, types.EllipsisType, types.BuiltinFunctionType, types.EllipsisType,
types.NotImplementedType, types.FunctionType, types.CodeType, types.NotImplementedType, types.FunctionType, types.CodeType,
weakref.ref, super): weakref.ref, super}
d[t] = _copy_immutable _copy_builtin_containers = {list, dict, set, bytearray}
d[list] = list.copy
d[dict] = dict.copy
d[set] = set.copy
d[bytearray] = bytearray.copy
del d, t
def deepcopy(x, memo=None, _nil=[]): def deepcopy(x, memo=None, _nil=[]):
"""Deep copy operation on arbitrary Python objects. """Deep copy operation on arbitrary Python objects.

2
Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst Normal file
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@ -0,0 +1,2 @@
Improve performance of :func:`copy.copy` by 30% via
a fast path for atomic types and container types.