f-string

In Python, an f-string, short for formatted string literal, is a useful feature that allows you to interpolate expressions inside string literals, using curly braces {}, to create a formatted string.

An f-string is prefixed with an f or F. In this type of string literal, you can include Python expressions, which are evaluated and formatted at runtime. F-strings support advanced formatting options, making them a popular choice for Python developers.

Example

Here’s an example of using f-strings to embed variables and expressions within a string:

Python 
>>> quantity = 6
>>> item = "bananas"
>>> price = 1.74

>>> f"{quantity} {item} cost ${price * quantity:.2f}"
'6 bananas cost $10.44'

In this example, you interpolate variables and expressions in an f-string using replacement fields delimited by curly braces. The expressions that you embed in an f-string can be almost arbitrarily complex. The example also shows how to use format specifiers in an f-string to format currency values.

Python's F-String: An Improved String Interpolation and Formatting Tool

Tutorial

Python's F-String for String Interpolation and Formatting

Python f-strings give you a readable, concise way to interpolate and format strings, and they beat .format() and the % operator on speed.

basics python

For additional information on related topics, take a look at the following resources:

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By Leodanis Pozo Ramos • Updated Sept. 21, 2026 • Reviewed by Dan Bader
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