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On this page:https://docs.python.org/3.14/library/string.html#grammar-token-format-spec-format_spec
format_spec: [options][width_and_precision][type]options: [[fill]align][sign]["z"]["#"]["0"]fill:<anycharacter>align:"<"|">"|"="|"^"sign:"+"|"-"|" "width_and_precision: [width_with_grouping][precision_with_grouping]width_with_grouping: [width][grouping]precision_with_grouping:"." [precision][grouping]width:digit+precision:digit+grouping:","|"_"type:"b"|"c"|"d"|"e"|"E"|"f"|"F"|"g"|"G"|"n"|"o"|"s"|"x"|"X"|"%"
Theprecision_with_grouping syntaxe is wrong, because it accepts. withoutprecision orgrouping. But
>>>f'{1234.1234:.f}'Traceback (mostrecentcalllast):File"<python-input-17>",line1,in<module>f'{1234.1234:.f}'^^^^^^^^^^^^^^ValueError:Formatspecifiermissingprecision
(The error does not mention grouping either)
The right syntax should be
precision_with_grouping:"."precision [grouping]|"."grouping
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