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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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2
Include/internal/pycore_format.h
View file

@ -14,12 +14,14 @@ extern "C" {
* F_BLANK ' '
* F_ALT '#'
* F_ZERO '0'
* F_NO_NEG_0 'z'
*/
#define F_LJUST (1<<0)
#define F_SIGN (1<<1)
#define F_BLANK (1<<2)
#define F_ALT (1<<3)
#define F_ZERO (1<<4)
#define F_NO_NEG_0 (1<<5)
#ifdef __cplusplus
}

1
Include/pystrtod.h
View file

@ -32,6 +32,7 @@ PyAPI_FUNC(double) _Py_parse_inf_or_nan(const char *p, char **endptr);
#define Py_DTSF_ADD_DOT_0 0x02 /* if the result is an integer add ".0" */
#define Py_DTSF_ALT 0x04 /* "alternate" formatting. it's format_code
specific */
#define Py_DTSF_NO_NEG_0 0x08 /* negative zero result is coerced to 0 */
/* PyOS_double_to_string's "type", if non-NULL, will be set to one of: */
#define Py_DTST_FINITE 0