python format number with commas f string

How to print a number using commas as thousands separators

stackoverflow.com › questions › 1823058 › how-to-print-a-number-using-commas-as-thousands-separators

Locale-agnostic: use `_` as the thousand separator

f'{value:_}'          # For Python ≥3.6

Note that this will NOT format in the user's current locale and will always use _ as the thousand separator, so for example:

1234567 ⟶ 1_234_567

English style: use `,` as the thousand separator

'{:,}'.format(value)  # For Python ≥2.7
f'{value:,}'          # For Python ≥3.6

Locale-aware

import locale
locale.setlocale(locale.LC_ALL, '')  # Use '' for auto, or force e.g. to 'en_US.UTF-8'

'{:n}'.format(value)  # For Python ≥2.7
f'{value:n}'          # For Python ≥3.6

Reference

Per Format Specification Mini-Language,

The ',' option signals the use of a comma for a thousands separator. For a locale aware separator, use the 'n' integer presentation type instead.

and:

The '_' option signals the use of an underscore for a thousands separator for floating point presentation types and for integer presentation type 'd'. For integer presentation types 'b', 'o', 'x', and 'X', underscores will be inserted every 4 digits.

Answer from Ian Schneider on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 1823058 › how-to-print-a-number-using-commas-as-thousands-separators

python - How to print a number using commas as thousands separators - Stack Overflow

Locale-agnostic: use `_` as the thousand separator

f'{value:_}'          # For Python ≥3.6

Note that this will NOT format in the user's current locale and will always use _ as the thousand separator, so for example:

1234567 ⟶ 1_234_567

English style: use `,` as the thousand separator

'{:,}'.format(value)  # For Python ≥2.7
f'{value:,}'          # For Python ≥3.6

Locale-aware

import locale
locale.setlocale(locale.LC_ALL, '')  # Use '' for auto, or force e.g. to 'en_US.UTF-8'

'{:n}'.format(value)  # For Python ≥2.7
f'{value:n}'          # For Python ≥3.6

Reference

Per Format Specification Mini-Language,

The ',' option signals the use of a comma for a thousands separator. For a locale aware separator, use the 'n' integer presentation type instead.

and:

The '_' option signals the use of an underscore for a thousands separator for floating point presentation types and for integer presentation type 'd'. For integer presentation types 'b', 'o', 'x', and 'X', underscores will be inserted every 4 digits.

2 of 16

408

I'm surprised that no one has mentioned that you can do this with f-strings in Python 3.6+ as easy as this:

>>> num = 10000000
>>> print(f"{num:,}")
10,000,000

... where the part after the colon is the format specifier. The comma is the separator character you want, so f"{num:_}" uses underscores instead of a comma. Only "," and "_" is possible to use with this method.

This is equivalent of using format(num, ",") for older versions of python 3.

This might look like magic when you see it the first time, but it's not. It's just part of the language, and something that's commonly needed enough to have a shortcut available. To read more about it, have a look at the group subcomponent.

GeeksforGeeks

geeksforgeeks.org › python › print-number-commas-1000-separators-python

Print number with commas as 1000 separators in Python - GeeksforGeeks

May 14, 2025 - ... Here, we have used the "{:,}" along with the format() function to add commas every thousand places starting from left. This is introduced in Python and it automatically adds a comma on writing the following syntax.

Discussions

How do I put commas between numbers?

Say this is your number. a_number = 1234567890 You can add the commas like this print(format(a_number, ",")) or like this. print(f"{a_number:,}") Either way, what you're doing here is using a "format specifier" to create a string from the number formatted the way you like. A , means to format your integer or floating point number with commas every third numbers to the left of the decimal. You can see the full list of format specifiers here in the documentation (though TBH it's a bit hard to find what you need in it). More on reddit.com

r/learnpython

7

11

October 24, 2021

Can anyone help me with this problem?

Write a function named format_number that takes a non-negative number as its only parameter. Your function should convert the number to a string and add commas as a thousands separator. For example, calling format_number(1000000) should return "1,000,000". More on discuss.python.org

discuss.python.org

0

November 19, 2022

How to use python with comma (,) instead of dot (.) as decimal separator?

You convert it before printing.

>>> print(str(3.5).replace(".",","))
3,5

Above code converts 3.5 to string, then replaces dot with comma.

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