Nick Coghlan <[email protected]> added the comment:
Aye, definitely worth a thread on python-ideas. My rationale for suggesting
something based on the built-in numeric codes is that it makes it
straightforward for *users* to transfer knowledge from that mini-language.
As far as parsing goes, I was thinking of something along the lines of the
following naive approach:
typechar = fmt[-1:]
if not typechar or typechar not in ("b", "n", "x"):
return super().__format__(fmt)
prefix, group_sep, suffix = fmt[:-1].rpartition("_")
if prefix and prefix != "#" or suffix:
return super().__format__(fmt)
field_width = self._calculate_field_width(typechar)
return format(int(self), f"{prefix}0{field_width}{group_sep}{type_char}")
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<https://bugs.python.org/issue32820>
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