From Newsgroup: comp.lang.python

Formatting an integer with 3 digits, excluding base specifier:

>>> "%#0.3x" % 2
'0x002'

No equivalent to this in any of the other ways that Python allows for formatting:

>>> format(2, "#03x")
'0x2'

(Not what I want)

>>> format(2, "#0.3x")
Traceback (most recent call last):
File "<python-input-10>", line 1, in <module>
format(2, "#0.3x")
~~~~~~^^^^^^^^^^^^
ValueError: Precision not allowed in integer format specifier

>>> "{:#03x}".format(2)
'0x2'

(Not what I want)

>>> "{:#0.3x}".format(2)
Traceback (most recent call last):
File "<python-input-13>", line 1, in <module>
"{:#0.3x}".format(2)
~~~~~~~~~~~~~~~~~^^^
ValueError: Precision not allowed in integer format specifier

Why not?
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From Newsgroup: comp.lang.python

On Sun, 19 Oct 2025 07:26:44 -0000 (UTC), Lawrence D’Oliveiro wrote:

Why not?

I have no idea

you could try zfill:

f"magic number: {'42'.zfill(4)}"

'magic number: 0042'

f"magic number: {str(42).zfill(4)}"

'magic number: 0042'

more info:
https://fstring.help/cheat/
--
Gilmeh

Necessity is a mother.
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From Newsgroup: comp.lang.python

Lawrence D’Oliveiro wrote:

Formatting an integer with 3 digits, excluding base specifier:

>>> "%#0.3x" % 2
'0x002'

No equivalent to this in any of the other ways that Python allows for formatting:

>>> format(2, "#03x")
'0x2'

(Not what I want)

>>> format(2, "#0.3x")
Traceback (most recent call last):
File "<python-input-10>", line 1, in <module>
format(2, "#0.3x")
~~~~~~^^^^^^^^^^^^
ValueError: Precision not allowed in integer format specifier

>>> "{:#03x}".format(2)
'0x2'

(Not what I want)

>>> "{:#0.3x}".format(2)
Traceback (most recent call last):
File "<python-input-13>", line 1, in <module>
"{:#0.3x}".format(2)
~~~~~~~~~~~~~~~~~^^^
ValueError: Precision not allowed in integer format specifier

Why not?

https://github.com/tpauldike/printf


songbird
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From Newsgroup: comp.lang.python

On Sun, 19 Oct 2025 10:01:16 -0400, songbird wrote:

Lawrence D’Oliveiro wrote:

Formatting an integer with 3 digits, excluding base specifier:

>>> "%#0.3x" % 2
'0x002'

No equivalent to this in any of the other ways that Python allows for
formatting:

Why not?

We already have printf-style formatting in Python, that’s what I was using above.
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From Newsgroup: comp.lang.python

Lawrence D’Oliveiro <[email protected]d> writes:

>>> "%#0.3x" % 2
'0x002'

f'0x{2:03x}
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From Newsgroup: comp.lang.python

Paul Rubin <[email protected]d> writes:

Lawrence D’Oliveiro <[email protected]d> writes:
> >>> "%#0.3x" % 2
> '0x002'

f'0x{2:03x}

Won't work for negative numbers.
--
Alan Bawden
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