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gh-145754: Update signature retrieval in unittest.mock to use forwardref annotation format#145756

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JelleZijlstra merged 8 commits intopython:mainfrom
mschoettle:patch-1
Mar 20, 2026
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gh-145754: Update signature retrieval in unittest.mock to use forwardref annotation format#145756
JelleZijlstra merged 8 commits intopython:mainfrom
mschoettle:patch-1

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@mschoettle mschoettle commented Mar 10, 2026 •
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Uses annotation format FORWARDREF instead of the default VALUE when calling inspect.signature.
STRING also seems to work but affects existing tests that check the signature.

Closes #145754

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@mschoettle mschoettle changed the title gh-145754: Update signature retrieval in unittest.mock to use string annotation format gh-145754: Update signature retrieval in unittest.mock to use forwardref annotation format Mar 10, 2026
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JelleZijlstra commented Mar 10, 2026

This change looks right to me, please add a unit test and we'll hopefully get it merged!

@JelleZijlstra JelleZijlstra added the needs backport to 3.14 bugs and security fixes label Mar 10, 2026
@mschoettle mschoettle marked this pull request as ready for review March 10, 2026 16:53
@mschoettle mschoettle requested a review from cjw296 as a code owner March 10, 2026 16:53
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mschoettle commented Mar 18, 2026

This change looks right to me, please add a unit test and we'll hopefully get it merged!

Thanks, @JelleZijlstra! I added a unit test. Are you able to review it or does it require @cjw296 as the code owner?

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JelleZijlstra reviewed Mar 19, 2026
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Sorry, looks like I never submitted this review.

I am comfortable merging this once I'm happy with the code.

mschoettle and others added 3 commits March 19, 2026 12:15
@JelleZijlstra JelleZijlstra merged commit d357a7d into python:main Mar 20, 2026
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miss-islington-app bot commented Mar 20, 2026

Thanks @mschoettle for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Mar 20, 2026
@mschoettle @miss-islington
pythongh-145754: Update signature retrieval in unittest.mock to use f…
186b50d 
…orwardref annotation format (pythonGH-145756)

(cherry picked from commit d357a7d)

Co-authored-by: Matthias Schoettle <git@mattsch.com>
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bedevere-app bot commented Mar 20, 2026

GH-146191 is a backport of this pull request to the 3.14 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.14 bugs and security fixes label Mar 20, 2026
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bedevere-bot commented Mar 20, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86 Debian Non-Debug with X 3.x (no tier) has failed when building commit d357a7d.

What do you need to do:

  1. Don't panic.
  2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1245/builds/7793) and take a look at the build logs.
  4. Check if the failure is related to this commit (d357a7d) or if it is a false positive.
  5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1245/builds/7793

Summary of the results of the build (if available):

==

Click to see traceback logs 
Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/contextlib.py"�[0m, line �[35m85�[0m, in �[35minner�[0m
    return func(*args, **kwds)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m597�[0m, in �[35mtest_interrupt�[0m
    exitcode = self._kill_process(multiprocessing.Process.interrupt)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/contextlib.py"�[0m, line �[35m85�[0m, in �[35minner�[0m
    return func(*args, **kwds)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m578�[0m, in �[35m_kill_process�[0m
    self.assertEqual(�[31mjoin�[0m�[1;31m()�[0m, None)
                     �[31m~~~~�[0m�[1;31m^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m251�[0m, in �[35m__call__�[0m
    return �[31mself.func�[0m�[1;31m(*args, **kwds)�[0m
           �[31m~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/process.py"�[0m, line �[35m156�[0m, in �[35mjoin�[0m
    res = self._popen.wait(timeout)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/popen_fork.py"�[0m, line �[35m44�[0m, in �[35mwait�[0m
    return �[31mself.poll�[0m�[1;31m(os.WNOHANG if timeout == 0.0 else 0)�[0m
           �[31m~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/popen_fork.py"�[0m, line �[35m28�[0m, in �[35mpoll�[0m
    pid, sts = �[31mos.waitpid�[0m�[1;31m(self.pid, flag)�[0m
               �[31m~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m574�[0m, in �[35mhandler�[0m
    raise RuntimeError('join took too long: %s' % p)
�[1;35mRuntimeError�[0m: �[35mjoin took too long: <Process name='Process-1' pid=12129 parent=12127 started daemon>�[0m


Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/contextlib.py"�[0m, line �[35m85�[0m, in �[35minner�[0m
    return func(*args, **kwds)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m597�[0m, in �[35mtest_interrupt�[0m
    exitcode = self._kill_process(multiprocessing.Process.interrupt)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/contextlib.py"�[0m, line �[35m85�[0m, in �[35minner�[0m
    return func(*args, **kwds)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m578�[0m, in �[35m_kill_process�[0m
    self.assertEqual(�[31mjoin�[0m�[1;31m()�[0m, None)
                     �[31m~~~~�[0m�[1;31m^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m251�[0m, in �[35m__call__�[0m
    return �[31mself.func�[0m�[1;31m(*args, **kwds)�[0m
           �[31m~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/process.py"�[0m, line �[35m156�[0m, in �[35mjoin�[0m
    res = self._popen.wait(timeout)
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/popen_fork.py"�[0m, line �[35m44�[0m, in �[35mwait�[0m
    return �[31mself.poll�[0m�[1;31m(os.WNOHANG if timeout == 0.0 else 0)�[0m
           �[31m~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/multiprocessing/popen_fork.py"�[0m, line �[35m28�[0m, in �[35mpoll�[0m
    pid, sts = �[31mos.waitpid�[0m�[1;31m(self.pid, flag)�[0m
               �[31m~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^�[0m
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.nondebug/build/Lib/test/_test_multiprocessing.py"�[0m, line �[35m574�[0m, in �[35mhandler�[0m
    raise RuntimeError('join took too long: %s' % p)
�[1;35mRuntimeError�[0m: �[35mjoin took too long: <Process name='Process-158' pid=21989 parent=19679 started daemon>�[0m

JelleZijlstra pushed a commit that referenced this pull request Mar 20, 2026
@miss-islington @mschoettle
[3.14] gh-145754: Update signature retrieval in unittest.mock to use …
7ba9580 
…forwardref annotation format (GH-145756) (#146191)

gh-145754: Update signature retrieval in unittest.mock to use forwardref annotation format (GH-145756)
(cherry picked from commit d357a7d)

Co-authored-by: Matthias Schoettle <git@mattsch.com>
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Autospeccing with unittest.mock is less robust with PEP 649

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