Eric V. Smith <[email protected]> added the comment:
> Except that I think that !f is not needed. You can use repr by default only
> when no format spec is specified, and add explicit !r if you want to use repr
> with the format spec. If you want to format the value without repr and the
> format spec -- specify the empty format spec: f"{foo=:}".
I had this working in issue36774, but it seems like a little too much magic. It
also prevents you from formatting the result of the repr, which works in
f-strings without the =.
Say you wanted a fixed width output. You need to apply a format to the value of
the repr:
>>> nums = [1/3, 1.0, 10.0, math.pi]
>>> for n in nums:
... print(f'*{n=}*')
...
*n=0.3333333333333333*
*n=1.0*
*n=10.0*
*n=3.141592653589793*
>>> for n in nums:
... print(f'*{n=:30}*')
...
*n=0.3333333333333333 *
*n=1.0 *
*n=10.0 *
*n=3.141592653589793 *
If the presence of a format spec meant automatically apply the format to the
value being printed, this wouldn't be possible.
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<https://bugs.python.org/issue36817>
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