Serhiy Storchaka <[email protected]> added the comment:
You can use f'*{n=!r:30}*' if you want to format the result of the repr.
In you example the format spec is applied to both the value and the literal
representation of the expression. Is it an error? I do not think this is an
expected behavior. If you want to apply it to both the literal expression and
its value you can use the nested f-string: f"*{f'{n=}':30}*".
There is not too much more magic here: if both converter and format specifier
are omitted use !r because it is a common special case. I think it is better
than the other difference in the default converter used for debugging and
normal formatting.
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<https://bugs.python.org/issue36817>
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