gh-113804: Add 'x' format to float.format()#119945
gh-113804: Add 'x' format to float.format()#119945vstinner wants to merge 1 commit intopython:mainfrom
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Not supported (raise ValueError):
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| | ``'x'`` | For :class:`float`, hex format. Outputs the number in | | ||
| | | base 16, using lower-case letters for the digits above 9.| | ||
| | | The alternate form adds ``'0x'`` prefix. | |
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| | ``'x'`` | For :class:`float`, hex format. Outputs the number in | | |
| | | base 16, using lower-case letters for the digits above 9.| | |
| | | The alternate form adds ``'0x'`` prefix. | | |
| | ``'x'`` | For :class:`float`, hex format, supported by | | |
| | | :meth:`~float.fromhex`. Represent the number by a | | |
| | | hexadecimal string in the form ``[±][0x]h[.hhh]p±d``, | | |
| | | using using lower-case letters for the digits above 9. | | |
| | | The exponent ``d`` is written in decimal, it always | | |
| | | contains at least one digit, and it gives the power of 2 | | |
| | | by which to multiply the coefficient. | | |
| | | | | |
| | | The alternate form adds ``'0x'`` prefix. | |
- maybe the first sentence + remark about lower-case is enough
- maybe we should document also 1-normalisation & case of subnormals.
Doc/library/string.rst
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| | | base 16, using lower-case letters for the digits above 9.| | ||
| | | The alternate form adds ``'0x'`` prefix. | | ||
| | | | | ||
| | | Precision and ``'='`` alignment are not supported. | |
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Hmm, what's wrong with =? This seems to be supported on my branch:
>>> f"{-1.1:30x}"
' -1.199999999999ap+0'
>>> f"{-1.1:=30x}"
'- 1.199999999999ap+0'
>>> f"{-1.111111:=30f}"
'- 1.111111'
>>> f"{-1.111111:30f}"
' -1.111111'There was a problem hiding this comment.
I was just too lazy to implement it. If it matters, I can change my implementation to support the "=" alignment as well.
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Why not simply use |
Do you mean: instead of adding this format? This format gives more formatting options: sign, 0x prefix, alignment. |
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It is not so difficult to process the result of |
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@mdickinson @tim-one: What do you think of this approach? Do you agree with @serhiy-storchaka that the existing |
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@vstinner For me having I do think |
Ok, I rewrote my PR to implement the |
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It was decided to not pursue this approach, since float.hex() exists and it's enough for most usages, and we don't want to make str.format() more complicated. |
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