How to Format Numbers with Thousands Separators in Python?

How to Print a Number with Commas as Thousands Separators

Formatting large numbers with thousands separators can enhance their readability. Here are several approaches to achieve this in Python:

Locale-Agnostic Solution

For a universal approach, regardless of locale, you can utilize an underscore as the separator:

f'{value:_}'  # For Python ≥3.6

However, this method will always employ the underscore, regardless of the current locale.

English Style

If you prefer the traditional English formatting, you can use a comma as the separator:

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

Locale-Aware Solution

To adapt to the user's locale, you can implement the following steps:

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

This method will use the appropriate separator based on the user's locale.

Reference

According to the Format Specification Mini-Language:

• The ',' option indicates a comma as the thousands separator.
• The '_' option employs an underscore as the thousands separator for floating point and 'd' integer presentation types.
• For 'b', 'o', 'x', and 'X' integer presentation types, underscores will be inserted every 4 digits.

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