Format specifiers: a quick reference
Format specifiers: a quick reference
Format specifiers actually constitute a 鈥渕ini-language鈥� of their own. For a complete reference, see the section entitled 鈥淔ormat Specification Mini-Language鈥� in the Python documentation for strings ().
Remember that format specifiers are optionally included in f-string replacement fields. The format specifier is separated from the replacement expression by a colon. Examples:
>>> x = 0.16251`
>>> f'{x:.1%}'
'16.3%'
>>> f'{x:.2f}'
'0.16'
>>> f'{x:>12}'
' 0.16251'
>>> f'{x:.3E}'
'1.625E-01'Here鈥檚 a quick reference for some commonly used format specifiers:
| option | meaning | example |
|---|---|---|
< |
align left, can be combined with width | <12 |
> |
align right, can be combined with width | >15 |
f |
fixed point notation, combined with precision | .2f |
% |
percentage (multiplies by 100 automatically) | .1% |
, |
use thousands separators, for example, 1,000 | , |
E |
scientific notation, combined with precision | .4E |
Copyright 漏 2023鈥�2025 Clayton Cafiero
No generative AI was used in producing this material. This was written the old-fashioned way.