How To Format Decimal Places In Python Using F-Strings?

As a developer working on numerous projects across the USA, I recently faced an issue where I needed to format currency values with a specific number of decimal places for our financial reports. After researching various string formatting techniques, I found that using f-strings is an efficient and readable way to format decimal places. I will help you learn how to format decimal places in Python using f-strings in this tutorial with examples.

Table of Contents

f-Strings in Python

F-strings, introduced in Python 3.6, provide a concise and expressive way to embed expressions inside string literals for formatting. They allow you to include variables, expressions, and even function calls directly within the string.

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Format Decimal Places with f-Strings in Python

To format a decimal number with a specific number of decimal places using f-strings in Python, you can use the .nf syntax, where n represents the desired number of decimal places. Here’s an example:

revenue = 1234.5678
print(f"The company's revenue is ${revenue:.2f}")

Output:

The company's revenue is $1234.57

I have executed the above example code and added the screenshot below.

Format Decimal Places in Python Using f-Strings

This example {revenue:.2f} specifies that the revenue variable should be formatted as a floating-point number with two decimal places.

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Example: Format Currency Values

Let’s consider a real-world scenario where we need to format currency values for a financial report. Suppose we have a list of transactions for a US-based company:

transactions = [
    {"customer": "John Smith", "amount": 124.99},
    {"customer": "Emma Johnson", "amount": 50.75},
    {"customer": "Michael Brown", "amount": 89.50},
    {"customer": "Olivia Davis", "amount": 200.00}
]

To format the transaction amounts with two decimal places and a dollar sign, we can use f-strings as follows:

for transaction in transactions:
    customer = transaction["customer"]
    amount = transaction["amount"]
    print(f"{customer}: ${amount:.2f}")

Output:

John Smith: $124.99
Emma Johnson: $50.75
Michael Brown: $89.50
Olivia Davis: $200.00

I have executed the above example code and added the screenshot below.

How to Format Decimal Places in Python Using f-Strings

By using {amount:.2f}, we ensure that each transaction amount is displayed with exactly two decimal places, making the output consistent and readable.

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Advanced Formatting with f-Strings

F-strings offer additional formatting options that can be useful when working with decimal places:

1. Thousands Separator

To format large numbers with a thousand separator, you can use the , symbol within the f-string. For example:

revenue = 1234567.89
print(f"The company's annual revenue is ${revenue:,.2f}")

Output:

The company's annual revenue is $1,234,567.89

I have executed the above example code and added the screenshot below.

Format Decimal Places in Python Using f-Strings advance

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2. Percentage Formatting

If you need to format decimal numbers as percentages, you can use the % symbol. Here’s an example:

growth_rate = 0.0875
print(f"The company's growth rate is {growth_rate:.2%}")

Output:

The company's growth rate is 8.75%

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Conclusion

In this tutorial, I have explained how to format decimal places in Python using f-strings. I discussed f-strings in Python, how to format decimal places with f-strings , and a real-world example. I also discussed some advanced formatting with f-strings.