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Spurious E231 for nested format substitutions #1241
Description
For
x = 1
digits = 1
print(f"{x:0.{digits:d}f}") # admittedly the :d is not needed in this minimal repro, but still valid.pycodestyle 2.11.1 spuriously complains about a missing whitespace after the second colon in the f-string:
test.py:3:21: E231 missing whitespace after ':'
Reacted by GosuJunk, Philip Nye, Antoni Szych and David Tiede
Activity
PNHD commentedon Aug 31, 2026
Hi! I have a tested fix for this issue ready in my fork:
PNHD/pycodestyle:fix/1241-nested-fstring-formatThe repository currently limits pull-request creation to collaborators, so I'm unable to open the PR myself.
The fix has been verified with the full upstream GitHub Actions matrix, tox, flake8, and pre-commit. It also includes regression coverage for the reported nested format-specifier case.
If you'd like, could you enable me to submit the PR or let me know the preferred contribution path?
asottile commentedon Aug 31, 2026
we don't accept ai slop contributions
inchang-ing commentedon Oct 22, 2026