Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
I have no strong opinion. I found the discrepancy when reviewed one of Mark's
PRs. I was surprised because I did not know that "N" is supported.
On other hand, there are reasons for supporting upper-case variant of "n" if we
support upper-case variants of "e", "g" and "x" (formats which produce output
containing letters).
There is an alternative solution of the problem solved by upper-case variations
of formats: add a special converter for converting a string to upper case, so
for example f'{x:12.8E}' could be written as f'{x:12.8e!u}'.
I prefer -1 or 2. If we choose deprecation I prefer adding an upper-case
converter.
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<https://bugs.python.org/issue45739>
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