How to pad numbers with variable substitution for padding width in format or f string?

Question

I want to pad a number i with a padding based on the value of the variable width

>>> width = 5
>>> i = 1
>>> print(f'{i:width}')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Invalid format specifier
>>>
>>> print('{:width}'.format(i))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Invalid format specifier

Desired output:

@Tomerikoo do you know of any updated versions of that covering f-strings? — Karl Knechtel, Jul 13 '22 at 13:38
@KarlKnechtel Not specifically, but I believe it mostly covers it (assuming some very basic understanding of the syntaxes). Anyway, it is possible to contribute to that site [through GitHub](https://github.com/ulope/pyformat.info) apparently — Tomerikoo, Jul 13 '22 at 13:44

score 3 · Accepted Answer · answered Aug 18 '19 at 17:50

3

You almost had it:

>>> width = 5
>>> i = 1
>>> print(f'{i:{width}}')
    1

answered Aug 18 '19 at 17:50

ruohola

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How to pad numbers with variable substitution for padding width in format or f string?

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