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`data/python.gram` produces wrong results when parsing fstring with `=` in `{}` #101

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zhenkuny opened this issue May 1, 2024 · 0 comments

zhenkuny commented May 1, 2024

python -m pegen data/python.gram -o python_parser.py

import ast
import python_parser as pp

print(ast.dump(pp.parse_string('f"{x=}"', 'eval')))
print(ast.dump(ast.parse('f"{x=}"', mode='eval')))

outputs this:

Expression(body=JoinedStr(values=[FormattedValue(value=Name(id='x', ctx=Load()), conversion=114)]))
Expression(body=JoinedStr(values=[Constant(value='x='), FormattedValue(value=Name(id='x', ctx=Load()), conversion=114)]))

We can see that "=" is not considered in the python.gram.

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