From d951b17e66032285b7418d233afee3aee6055922 Mon Sep 17 00:00:00 2001
From: Pieter Eendebak <pieter.eendebak@gmail.com>
Date: Fri, 20 Dec 2024 09:45:08 +0100
Subject: [PATCH 1/4] Refactor copy.copy

---
 Lib/copy.py | 27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/Lib/copy.py b/Lib/copy.py
index f27e109973cfb7..628d0c7c6360f5 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -67,13 +67,15 @@ def copy(x):
 
     cls = type(x)
 
-    copier = _copy_dispatch.get(cls)
-    if copier:
-        return copier(x)
+    if cls in _copy_atomic_types:
+        return x
+    if cls in _copy_builtin_containers:
+        return cls.copy(x)
+
 
     if issubclass(cls, type):
         # treat it as a regular class:
-        return _copy_immutable(x)
+        return x
 
     copier = getattr(cls, "__copy__", None)
     if copier is not None:
@@ -98,23 +100,12 @@ def copy(x):
     return _reconstruct(x, None, *rv)
 
 
-_copy_dispatch = d = {}
-
-def _copy_immutable(x):
-    return x
-for t in (types.NoneType, int, float, bool, complex, str, tuple,
+_copy_atomic_types = (types.NoneType, int, float, bool, complex, str, tuple,
           bytes, frozenset, type, range, slice, property,
           types.BuiltinFunctionType, types.EllipsisType,
           types.NotImplementedType, types.FunctionType, types.CodeType,
-          weakref.ref, super):
-    d[t] = _copy_immutable
-
-d[list] = list.copy
-d[dict] = dict.copy
-d[set] = set.copy
-d[bytearray] = bytearray.copy
-
-del d, t
+          weakref.ref, super)
+_copy_builtin_containers = (list, dict, set, bytearray)
 
 def deepcopy(x, memo=None, _nil=[]):
     """Deep copy operation on arbitrary Python objects.

From 742aa885bd3176b8cf800504a93d9597a8c883c4 Mon Sep 17 00:00:00 2001
From: Pieter Eendebak <pieter.eendebak@gmail.com>
Date: Fri, 20 Dec 2024 10:38:52 +0100
Subject: [PATCH 2/4] use set instead of tuple

---
 Lib/copy.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Lib/copy.py b/Lib/copy.py
index 628d0c7c6360f5..c64fc0761793f5 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -100,12 +100,12 @@ def copy(x):
     return _reconstruct(x, None, *rv)
 
 
-_copy_atomic_types = (types.NoneType, int, float, bool, complex, str, tuple,
+_copy_atomic_types = {types.NoneType, int, float, bool, complex, str, tuple,
           bytes, frozenset, type, range, slice, property,
           types.BuiltinFunctionType, types.EllipsisType,
           types.NotImplementedType, types.FunctionType, types.CodeType,
-          weakref.ref, super)
-_copy_builtin_containers = (list, dict, set, bytearray)
+          weakref.ref, super}
+_copy_builtin_containers = {list, dict, set, bytearray}
 
 def deepcopy(x, memo=None, _nil=[]):
     """Deep copy operation on arbitrary Python objects.

From c2e6a4a378a0bcbef124c8641c3e942960ce31fd Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Fri, 20 Dec 2024 10:57:14 +0000
Subject: [PATCH 3/4] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst  | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst

diff --git a/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst b/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
new file mode 100644
index 00000000000000..2bd2f82ad423b7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
@@ -0,0 +1 @@
+Improve performance of :func:`copy.copy` by adding a fast path for atomic types and container types.

From 9490a2383ad8971c21187f17397b27826e243e6b Mon Sep 17 00:00:00 2001
From: Pieter Eendebak <pieter.eendebak@gmail.com>
Date: Thu, 26 Dec 2024 22:31:39 +0100
Subject: [PATCH 4/4] Update
 Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
---
 .../Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst b/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
index 2bd2f82ad423b7..bc2898edfda721 100644
--- a/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
+++ b/Misc/NEWS.d/next/Library/2024-12-20-10-57-10.gh-issue-128118.mYak8i.rst
@@ -1 +1,2 @@
-Improve performance of :func:`copy.copy` by adding a fast path for atomic types and container types.
+Improve performance of :func:`copy.copy` by 30% via
+a fast path for atomic types and container types.