Update Lib/dataclasses.py

Improve comment describing _ATOMIC_TYPES Co-authored-by: Carl Meyer <carl@oddbird.net>
python · AlexWaygood · Apr 10, 2023 · Mar 20, 2023 · Mar 20, 2023 · Mar 20, 2023
commit b6d8a6f7b5f04fe16e0853ce2c95c583cd289493
@@ -222,8 +222,8 @@ def __repr__(self):
 # https://bugs.python.org/issue33453 for details.
 _MODULE_IDENTIFIER_RE = re.compile(r'^(?:\s*(\w+)\s*\.)?\s*(\w+)')

-# Types for which deepcopy(obj) is known to return obj unmodified
-# Used to skip deepcopy in asdict and astuple for performance
+# Atomic immutable types which don't require any recursive handling and for which deepcopy
+# returns the same object. We can provide a fast-path for these types in asdict and astuple.
 _ATOMIC_TYPES = {
    # Common JSON Serializable types
    types.NoneType,