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gh-132493: Avoid eager evaluation of annotations in `@reprlib.recursive_repr()` by JelleZijlstra · Pull Request #133411 · python/cpython · GitHub

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gh-132493: Avoid eager evaluation of annotations in @reprlib.recursive_repr() #133411

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Merged
JelleZijlstra merged 2 commits into from
May 6, 2025
+19 −2
Conversation 0 Commits 2 Checks 0 Files changed 3
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gh-132493: Avoid eager evaluation of annotations in @reprlib.recursive_repr() #133411

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gh-132493: Avoid eager evaluation of annotations in `@reprlib.recursi…
JelleZijlstra May 4, 2025
2f9c92b
Merge branch 'main' into recursiverepr
JelleZijlstra May 4, 2025
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2 changes: 1 addition & 1 deletion Lib/reprlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@ def wrapper(self):
wrapper.__doc__ = getattr(user_function, '__doc__')
wrapper.__name__ = getattr(user_function, '__name__')
wrapper.__qualname__ = getattr(user_function, '__qualname__')
wrapper.__annotations__ = getattr(user_function, '__annotations__', {})
wrapper.__annotate__ = getattr(user_function, '__annotate__', None)
wrapper.__type_params__ = getattr(user_function, '__type_params__', ())
wrapper.__wrapped__ = user_function
return wrapper
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17 changes: 16 additions & 1 deletion Lib/test/test_reprlib.py
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Expand Up @@ -3,6 +3,7 @@
Nick Mathewson
"""

import annotationlib
import sys
import os
import shutil
Expand All @@ -11,7 +12,7 @@
import unittest
import textwrap

from test.support import verbose
from test.support import verbose, EqualToForwardRef
from test.support.os_helper import create_empty_file
from reprlib import repr as r # Don't shadow builtin repr
from reprlib import Repr
Expand Down Expand Up @@ -829,5 +830,19 @@ def __repr__[T: str](self, default: T = '') -> str:
self.assertEqual(type_params[0].__name__, 'T')
self.assertEqual(type_params[0].__bound__, str)

def test_annotations(self):
class My:
@recursive_repr()
def __repr__(self, default: undefined = ...):
return default

annotations = annotationlib.get_annotations(
My.__repr__, format=annotationlib.Format.FORWARDREF
)
self.assertEqual(
annotations,
{'default': EqualToForwardRef("undefined", owner=My.__repr__)}
)

if __name__ == "__main__":
unittest.main()
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-05-04-16-37-28.gh-issue-132493.5yjZ75.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Avoid eagerly evaluating annotations in functions decorated with
:func:`reprlib.recursive_repr`.
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