Eric V. Smith <[email protected]> added the comment:
I agree that could probably be simplified, if the format_spec is constant
(which it need not be).
>>> ast.dump(ast.parse('f"is {x:d}"'))
"Module(body=[Expr(value=JoinedStr(values=[Str(s='is '),
FormattedValue(value=Name(id='x', ctx=Load()), conversion=-1,
format_spec=JoinedStr(values=[Str(s='d')]))]))])"
But:
ast.dump(ast.parse('f"is {x:{length+1}d}"'))
"Module(body=[Expr(value=JoinedStr(values=[Str(s='is '),
FormattedValue(value=Name(id='x', ctx=Load()), conversion=-1,
format_spec=JoinedStr(values=[FormattedValue(value=BinOp(left=Name(id='length',
ctx=Load()), op=Add(), right=Num(n=1)), conversion=-1, format_spec=None),
Str(s='d')]))]))])"
----------
nosy: +eric.smith
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<https://bugs.python.org/issue39760>
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