How to format to n decimal places in Python

Question

I have a variable n and I want to print n decimal places.

import math
n = 5
print(f"{math.pi:.nf}")

ValueError: Format specifier missing precision

This doesn't work, but how might it be done?

Does this answer your question? [Limiting floats to two decimal points](https://stackoverflow.com/questions/455612/limiting-floats-to-two-decimal-points) — Kushan Gunasekera, Feb 03 '21 at 00:00

score 14 · Accepted Answer · answered Jan 28 '21 at 16:03

14

Fields in format strings can be nested:

>>> print(f"{math.pi:.{n}f}")
3.14159

answered Jan 28 '21 at 16:03

Thomas

score 5 · Answer 2 · edited Jan 28 '21 at 16:07

5

For pre-3.6 versions, you can use .format()

print('{:.{}}'.format(math.pi, n)))

edited Jan 28 '21 at 16:07

answered Jan 28 '21 at 16:04

BeanBagTheCat

2 Answers2