Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
This conversion is very special. For all other conversions
{value:!c:format_spec} is equivalent to format(conv(value), format_spec), but
not this conversion. It is also specific for f-strings, and is not particularly
useful in format strings.
Would not be better to use more special syntax for it? For example "!=" or
"!!"? Letters can be reserved for future "normal" conversions. It may be we
even allowed to register new converters by name.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36774>
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