ast: FormattedValue.conversion cannot be None #7810
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```
In [4]: ast.dump(ast.parse('f"{x!r}"'))
Out[4]: "Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='x', ctx=Load()), conversion=114)]))], type_ignores=[])"
In [5]: ast.dump(ast.parse('f"{x}"'))
Out[5]: "Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='x', ctx=Load()), conversion=-1)]))], type_ignores=[])"
```
(On 3.9 but I don't think this has changed since 3.6.)
The stdlib also assumes this: https://github.com/python/cpython/blob/main/Lib/ast.py#L1211 (`chr(None)` doesn't work).
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JelleZijlstra
commented
May 9, 2022
JelleZijlstra
commented
May 9, 2022
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I think you might only need the allowlist on py39 |
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I guess so, I wonder what changed in 3.9. |
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Well 3.9 changing stuff is believable, the better question is what happened in 3.10 and the answer is Batuhan made things better: python/cpython#30467 |
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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(On 3.9 but I don't think this has changed since 3.6.)
The stdlib also assumes this: https://github.com/python/cpython/blob/main/Lib/ast.py#L1211 (
chr(None)doesn't work).