[issue36774] f-strings: Add a !d conversion for ease of debugging

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

And for those who *really* want to be able to apply a format spec to the result of the entire !d expression, you can always use nested f-strings:

>>> for x in [3.1415, 0.5772156649, 100]:
...   print(f'{f"{x!d:.1f}":*^20}')
... 
*******x=3.1********
*******x=0.6********
******x=100.0*******

Not that I recommend this, but at least it's possible.

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<https://bugs.python.org/issue36774>
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