Nick Coghlan wrote:
Doing the right thing for negative numbers is a good point. It also
means the prefix can be handled properly when dealing with aligned
fields. The following update to the standard format specifier in the PEP:
[[fill]align][#][sign][0][minimumwidth][.precision][type]
The '#' prefix option inserts the appropriate prefix characters ('0b',
'0o', '0x', '0X') when displaying numbers in binary, octal or
hexadecimal formats. The prefix is inserted into the displayed number
after the sign character and fill characters (if any), but before any
leading zeroes.
I was implementing this today, and I note that %-formatting doesn't
specify an order among the #, sign, and 0 flags (at least not that I
could tell by experimentation). PEP 3101 does say that sign comes
before 0 for str.format(). Do we want the # to come before sign? Do we
want an order at all?
This sort of surprised me when I was writing tests. Even after having
implemented it, I was expecting "-#x" to work, but it needs to be "#-x".
I don't mind there being a fixed order (in fact I prefer it for a number
of reasons), I just want to make sure that the order specified above is
what we want to go with.
Eric.
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