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False positive f-string SyntaxError #7778

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#7780
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False positive f-string SyntaxError#7778
#7780
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dhruvmanila
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bugAn issue describing something that isn't working, or a PR that fixes a bugparserRelated to the parser

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@youknowone
youknowone
opened on Oct 3, 2023
# x.py
f"{1:{{1}.pop()}{f'n'}}"
$ ruff x.py
error: Failed to parse x.py:1:16: f-string: single '}' is not allowed
x.py:1:16: E999 SyntaxError: f-string: single '}' is not allowed
Found 1 error.
$ ruff --version
ruff 0.0.292

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  1. dhruvmanila commented on Oct 3, 2023

    @dhruvmanila
    dhruvmanila
    on Oct 3, 2023
    Member

    Thanks for the bug report! It seems to be caused by the two {{ inside the format spec part. It seems that the rules for escaping {/} are different in and out of a format spec.

  2. dhruvmanila
    added
    bugAn issue describing something that isn't working, or a PR that fixes a bug
    parserRelated to the parser
    on Oct 3, 2023
  3. dhruvmanila
    self-assigned this
    on Oct 3, 2023
  4. dhruvmanila
    closed this as completedin #7780on Oct 3, 2023
  5. dhruvmanila
    added a commit that references this issue on Oct 3, 2023

    Avoid curly brace escape in f-string format spec (#7780)

    69b8136
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