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bpo-45995: add "z" format specifer to coerce negative 0 to zero (GH-30049)

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Add "z" format specifier to coerce negative 0 to zero.

See https://github.com/python/cpython/issues/90153 (originally https://bugs.python.org/issue45995) for discussion.
This covers `str.format()` and f-strings.  Old-style string interpolation is not supported.

Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
This commit is contained in:
John Belmonte 2022-04-11 23:34:18 +09:00 • committed by GitHub
parent dd207a6ac5
commit b0b836b20c
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16 changed files with 368 additions and 43 deletions
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9
Lib/_pydecimal.py
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@ -3795,6 +3795,10 @@ class Decimal(object):
# represented in fixed point; rescale them to 0e0.
if not self and self._exp > 0 and spec['type'] in 'fF%':
self = self._rescale(0, rounding)
if not self and spec['no_neg_0'] and self._sign:
adjusted_sign = 0
else:
adjusted_sign = self._sign
# figure out placement of the decimal point
leftdigits = self._exp + len(self._int)
@ -3825,7 +3829,7 @@ class Decimal(object):
# done with the decimal-specific stuff; hand over the rest
# of the formatting to the _format_number function
return _format_number(self._sign, intpart, fracpart, exp, spec)
return _format_number(adjusted_sign, intpart, fracpart, exp, spec)
def _dec_from_triple(sign, coefficient, exponent, special=False):
"""Create a decimal instance directly, without any validation,
@ -6143,7 +6147,7 @@ _exact_half = re.compile('50*$').match
#
# A format specifier for Decimal looks like:
#
# [[fill]align][sign][#][0][minimumwidth][,][.precision][type]
# [[fill]align][sign][z][#][0][minimumwidth][,][.precision][type]
_parse_format_specifier_regex = re.compile(r"""\A
(?:
@ -6151,6 +6155,7 @@ _parse_format_specifier_regex = re.compile(r"""\A
(?P<align>[<>=^])
)?
(?P<sign>[-+ ])?
(?P<no_neg_0>z)?
(?P<alt>\#)?
(?P<zeropad>0)?
(?P<minimumwidth>(?!0)\d+)?