Michael Amrhein <mich...@adrhinum.de> added the comment:
Mark, I mostly agree with your classifications / proposals.
Regarding cases 3-7 I'd like to suggest a slightly different resolution:
Following my interpretation of the spec ("use zeropad *only* if no align is
given"), "<020", ">020", "^020" and "=020" would be treated equivalent to
"<20", ">20", "^20" and "=20":
format(12345, "<020") -> '-12345 ', not '-1234500000000000000'
format(12345, ">020") -> ' -12345', not '00000000000000-12345'
format(12345, "^020") -> ' -12345 ', not '0000000-123450000000'
format(12345, "=020") -> '- 12345', not '-0000000000000012345'
For '<', '>' and '^' I can't imagine any code depending on the current
behaviour of int and float, so this change is unlikely to break anything.
For '=' it might be reasonable to make an exception (and state it in the doc),
so that "020", "=020", "0=020" and "0=20" are treated as equivalent.
For Decimal this would mean to loosen the behaviour, as you proposed.
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<https://bugs.python.org/issue39077>
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