How Can I Format Numbers in Python with Thousand Separators?

Printing Numbers with Thousand Separators

In many scenarios, it's desirable to display large numbers with commas as thousands separators for readability. Python provides several methods to achieve this, depending on your specific requirements.

Locale-Agnostic: Using Underscore

To insert commas as thousand separators regardless of the user's locale, use the _ format specifier:

print(f'{value:_}')  # Python 3.6+

This will always use an underscore as the thousand separator. For example:

1234567  -->  1_234_567

English Style: Using Comma

To use a comma as the thousand separator, specific to English-language settings:

print('{:,}'.format(value))  # Python 2.7+
print(f'{value:,}')  # Python 3.6+

Locale-Aware: Using 'n' Format Specifier

For locale-aware formatting, which uses the thousand separator appropriate to the user's chosen locale, use the 'n' format specifier:

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

print('{:n}'.format(value))  # Python 2.7+
print(f'{value:n}')  # Python 3.6+

Reference and Notes

According to the Python Format Specification Mini-Language:

• The ',' option uses a comma for a thousands separator.
• The 'n' specifier provides locale-aware formatting, using the appropriate thousand separator.
• The '_' option uses an underscore for a thousands separator for floating-point and integer presentations 'd'. For integer presentations 'b', 'o', 'x', and 'X', underscores are inserted every four digits.

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