How Do I Format Numbers with Thousands Separators in Python?

How to Print a Number with Thousands Separators

When dealing with large numbers, it's often helpful to add thousands separators to improve readability. Python offers several ways to achieve this.

Locale-Agnostic: Using _ as the Separator

For a locale-agnostic approach, where the separator is not based on the user's locale, you can use the _ character as the separator. This will work in Python 3.6 and above:

f'{value:_}'

English Style: Using Commas

To specifically use commas as thousand separators, similar to the English style, you can use the following syntax:

'{:,}'.format(value)  # Python 2.7 and above
f'{value:,}'          # Python 3.6 and above

Locale-Aware

Python also supports locale-aware formatting, which will automatically adjust the separator based on the user's current locale. To do this, import the locale module and set the locale accordingly:

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

'{:n}'.format(value)  # Python 2.7 and above
f'{value:n}'          # Python 3.6 and above

Reference:

For a more detailed explanation, you can refer to the Format Specification Mini-Language documentation. In summary:

• Use ',' for commas as separators.
• Use 'n' for locale-aware separators.
• Use '_' for underscore separators in specific cases.

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