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gh-154610: Add !R to f-string and %#R to PyUnicode_FromFormat() - #157685

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gh-154610: Add !R to f-string and %#R to PyUnicode_FromFormat()#157685
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@vstinner vstinner commented Sep 17, 2026 •
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Similar to %R, but don't call __repr__() on str subclasses.

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pythongh-154610: Add %#R format to PyUnicode_FromFormat()
ac88b36 
Similar to %R, but don't call __str__() on str subclasses.
@bedevere-app bedevere-app Bot mentioned this pull request Sep 17, 2026
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@bedevere-app bedevere-app Bot added tests Tests in the Lib/test dir awaiting core review labels Sep 17, 2026
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vstinner commented Sep 17, 2026

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If this change is accepted and merged, I will update my PR gh-154614 to use %#R instead of %R.

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read-the-docs-community Bot commented Sep 17, 2026 •
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Documentation build overview

📚 cpython-previews | 🛠️ Build #34618427 | 📁 Comparing 6507b80 against main (8759666)

  🔍 Preview build  

3 files changed
± c-api/unicode.html
± whatsnew/3.16.html
± whatsnew/changelog.html

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vstinner marked this pull request as draft September 17, 2026 15:50
@vstinner vstinner changed the title gh-154610: Add %#R format to PyUnicode_FromFormat() gh-154610: Add !R to f-string and %#R to PyUnicode_FromFormat() Sep 17, 2026
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vstinner commented Sep 17, 2026

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I also created https://discuss.python.org/t/add-r-conversion-to-f-string-and-str-format-to-format-error-messages/109098 discussion for this change.

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vstinner commented Sep 17, 2026

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ruff check fails in the Lint CI:

Error: Lib/test/test_fstring.py:1374:33: invalid-syntax: f-string: invalid conversion character
Error: Lib/test/test_tstring.py:114:26: invalid-syntax: t-string: invalid conversion character

I failed to find a way to ignore invalid syntax per line in ruff.

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