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Fix an invalid quote escaping bug in f-string expressions. #3509

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merged 4 commits into from
Jan 22, 2023

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@yilei yilei commented Jan 20, 2023

Description

Fixes #3506

We can't simply escape the quotes in a naked f-string when merging string groups, because backslashes are invalid.

The quotes in f-string expressions should be toggled (this is safe since quotes can't be reused).

This fix also means implicitly concatenated f-strings with different quotes can now be merged or quote-normalized by changing the quotes used in expressions. e.g.:

         raise sa_exc.UnboundExecutionError(
             "Could not locate a bind configured on "
-            f'{", ".join(context)} or this Session.'
+            f"{', '.join(context)} or this Session."
         )

Checklist - did you ...

  • Add an entry in CHANGES.md if necessary?
  • Add / update tests if necessary?
  • Add new / update outdated documentation?

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github-actions bot commented Jan 20, 2023

diff-shades results comparing this PR (f2801ef) to main (91e1e13). The full diff is available in the logs under the "Generate HTML diff report" step.

╭─────────────────────── Summary ────────────────────────╮
│ 1 projects & 2 files changed / 7 changes [+3/-4]       │
│                                                        │
│ ... out of 2 387 283 lines, 11 470 files & 23 projects │
╰────────────────────────────────────────────────────────╯

Differences found.

What is this? | Workflow run | diff-shades documentation

@JelleZijlstra JelleZijlstra merged commit a36878e into psf:main Jan 22, 2023
@yilei yilei deleted the fstring branch January 24, 2023 03:02
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--preview flag produces INTERNAL ERROR: f-string expression part cannot include a backslash
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