How Do You Format Large Numbers in Python?

Python provides several ways to format large numbers for better readability. Here's how:

Using Commas

You can use the built-in format() function to insert commas as thousands separators:

number = 1234567890
formatted_number = format(number, ",")
print(formatted_number)  # Output: 1,234,567,890

Using f-strings

f-strings offer a more concise way to format numbers:

number = 1234567890
formatted_number = f"{number:,}"
print(formatted_number)  # Output: 1,234,567,890

Using the locale Module

The locale module allows you to customize number formatting based on the user's locale:

import locale

locale.setlocale(locale.LC_ALL, 'en_US')  # Set locale to US English
number = 1234567890
formatted_number = locale.format("%d", number, grouping=True)
print(formatted_number)  # Output: 1,234,567,890

Using the Decimal Module

For precise formatting of large decimal numbers, use the Decimal module:

from decimal import Decimal

number = Decimal('1234567890.1234567890')
formatted_number = format(number, ".2f")
print(formatted_number)  # Output: 1234567890.12

By choosing the appropriate method, you can easily format large numbers in Python, making them more readable and user-friendly.