Python f-strings

Here are some examples of f-strings in Python inspired by a post and a cheat sheet.

a = 2
b = 3

f"{a} + {b}"

'2 + 3'

f"{a=} and {b=}"

'a=2 and b=3'

f"a + b = {a+b}"

'a + b = 5'

Curly brackets in an f-string

n = 123

f'{{}}-{n}-{{{n}}}'

'{}-123-{123}'

Number formatting

var = 1234567890.1234

f'{var:,}'

'1,234,567,890.1234'

f'round: {var:.2f}'

'round: 1234567890.12'

f'comma: {var:,}'

'comma: 1,234,567,890.1234'

f'comma: {var:,.2f}'

'comma: 1,234,567,890.12'

import datetime

dt = datetime.datetime(2026, 2, 21, 19, 45, 30)

f'{dt}'

'2026-02-21 19:45:30'

f'{dt:%Y-%m-%d}'

'2026-02-21'

f'{dt.isoformat()}'

'2026-02-21T19:45:30'

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