Can't compile curly braces in format string

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
compilers

Research direction

Reproduce the reported f-string expression in Transcrypt and compare its handling with Python's literal-brace behavior. Trace the compiler entry point for f-strings and brace escaping, then add coverage for the example; done means it compiles without aborting and produces the expected '{foo}' output.

Written by the indexing model from the issue text.

Description

IS: bug

This expression can't compile and results in an aborted file:

s = 'foo'
f'{{{s}}}'

In Python this results in literal curly braces around the formatted variable:

>>> s = 'foo'
>>> f'{{{s}}}'
'{foo}'

Of course, a workaround is pretty trivial, but I thought it was interesting.

Dominant language
Python
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Forks
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