From 88a816de967749a2cc689bbb22f0a059cf6383fc Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <raymond.hettinger@gmail.com>
Date: Sun, 14 May 2023 17:36:43 -0500
Subject: [PATCH 1/3] Faster __repr__ with str.__add__ moved inside the
 f-string.

---
 Lib/dataclasses.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index 3eacba840db426..5154ef8230bee6 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -627,7 +627,7 @@ def _init_fn(fields, std_fields, kw_only_fields, frozen, has_post_init,
 def _repr_fn(fields, globals):
     fn = _create_fn('__repr__',
                     ('self',),
-                    ['return self.__class__.__qualname__ + f"(' +
+                    ['return f"{self.__class__.__qualname__}(' +
                      ', '.join([f"{f.name}={{self.{f.name}!r}}"
                                 for f in fields]) +
                      ')"'],

From bce2e722df899c8e7e70772fb6eeeeee00afef91 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <raymond.hettinger@gmail.com>
Date: Wed, 24 May 2023 17:15:44 -0500
Subject: [PATCH 2/3] Almost there

---
 Lib/dataclasses.py | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index 5154ef8230bee6..b1f8ec5305ec44 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -1085,13 +1085,17 @@ def _process_class(cls, init, repr, eq, order, unsafe_hash, frozen,
     if eq:
         # Create __eq__ method.  There's no need for a __ne__ method,
         # since python will call __eq__ and negate it.
-        flds = [f for f in field_list if f.compare]
-        self_tuple = _tuple_str('self', flds)
-        other_tuple = _tuple_str('other', flds)
-        _set_new_attribute(cls, '__eq__',
-                           _cmp_fn('__eq__', '==',
-                                   self_tuple, other_tuple,
-                                   globals=globals))
+        cmp_fields = (field for field in field_list if f.compare)
+        terms = [f'self.{field.name}==other.{field.name}' for field in cmp_fields]
+        field_comparisons = ' and '.join(terms) or 'True'
+        body =  [f'if other.__class__ is self.__class__:',
+                 f' return { field_comparisons}',
+                 f'return NotImplemented']
+        func = _create_fn('__eq__',
+                          ('self', 'other'),
+                          body,
+                          globals=globals)
+        _set_new_attribute(cls, '__eq__', func)
 
     if order:
         # Create and set the ordering methods.

From cfa5a06f863c278eafa6de8d18057ef8edbf617c Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <raymond.hettinger@gmail.com>
Date: Wed, 24 May 2023 17:36:25 -0500
Subject: [PATCH 3/3] Faster __eq__

---
 Lib/dataclasses.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index b1f8ec5305ec44..e766a7b554afe1 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -1085,11 +1085,11 @@ def _process_class(cls, init, repr, eq, order, unsafe_hash, frozen,
     if eq:
         # Create __eq__ method.  There's no need for a __ne__ method,
         # since python will call __eq__ and negate it.
-        cmp_fields = (field for field in field_list if f.compare)
+        cmp_fields = (field for field in field_list if field.compare)
         terms = [f'self.{field.name}==other.{field.name}' for field in cmp_fields]
         field_comparisons = ' and '.join(terms) or 'True'
         body =  [f'if other.__class__ is self.__class__:',
-                 f' return { field_comparisons}',
+                 f' return {field_comparisons}',
                  f'return NotImplemented']
         func = _create_fn('__eq__',
                           ('self', 'other'),