gh-151443: Fix documented default of read_data in unittest.mock.mock_open

[iamsharduld]

The documented signature of unittest.mock.mock_open shows read_data=None, but the real default is the empty string '':

• Lib/unittest/mock.py: def mock_open(mock=None, read_data=''):
• the function's own docstring ("This is an empty string by default")
• inspect.signature(mock_open) -> (mock=None, read_data='')

The default was changed from None to '' in 2012 (0dccf657b51); the documentation was never updated. This corrects the signature in the docs.

Documentation-only change, so no Misc/NEWS.d entry is included.

• Issue: Docs: unittest.mock.mock_open documents the wrong default for read_data #151443

[python-cla-bot]

All commit authors signed the Contributor License Agreement.

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #33126962 | 📁 Comparing 9dfc211 against main (e933987)

  🔍 Preview build  

2 files changed

± library/unittest.mock.html
± whatsnew/changelog.html

[StanFromIreland]

Please sign the CLA.

[StanFromIreland]

LGTM

[iamsharduld]

Done, CLA signed

[StanFromIreland]

Just for the future, please do not use the Update Branch button unless necessary (e.g. fixing conflicts, jogging the CI, or very old PRs) as it uses valuable resources. For more information see the devguide.

[miss-islington-app]

Thanks @iamsharduld for the PR, and @StanFromIreland for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖

[bedevere-app]

GH-151450 is a backport of this pull request to the 3.15 branch.

[bedevere-app]

GH-151451 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-151452 is a backport of this pull request to the 3.13 branch.

[iamsharduld]

Just for the future, please do not use the Update Branch button unless necessary (e.g. fixing conflicts, jogging the CI, or very old PRs) as it uses valuable resources. For more information see the devguide.

I see, thanks for the heads up and quick merge!

[StanFromIreland]

Thanks for the PR!