format(Fraction(1, 3), '.016f') raises ValueError #130662
Description
Bug report
Bug description:
c.f.
>>> format(float(Fraction(1, 3)), '.016f')
'0.3333333333333333'Looking on docs, I think that float formatting better conforms to the specification.
Similar issue is valid for the width:
>>> format(float(Fraction(1, 3)), '0030.016f')
'0000000000000.3333333333333333'
>>> format(Fraction(1, 3), '0030.016f')
Traceback (most recent call last):
File "<python-input-3>", line 1, in <module>
format(Fraction(1, 3), '0030.016f')
~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/fractions.py", line 577, in __format__
raise ValueError(
...<2 lines>...
)
ValueError: Invalid format specifier '0030.016f' for object of type 'Fraction'CPython versions tested on:
CPython main branch
Operating systems tested on:
No response
Linked PRs
- gh-130662: accept leading zeros in precision/width for Fraction's formatting #130663
- gh-130662: refine width/precision specification in format-spec #130717
- gh-130662: accept leading zeros in precision/width for Decimal's formatting #132549
- [3.14] gh-130662: Accept leading zeros in precision/width for Fraction's formatting (GH-130663) #135026
- [3.14] gh-130662: Accept leading zeros in precision/width for Fraction's formatting (GH-130663) #136361
- [3.14] gh-130662: Accept leading zeros in precision/width for Decimal's formatting (GH-132549) #136362