fstring

fstring, also known as formatted string literals, is a feature introduced in Python 3.6 that provides a more concise and readable way to embed expressions inside string literals. The syntax involves prefixing a string with the letter 'f' or 'F', followed by curly braces {} which contain Python expressions. These expressions are evaluated at runtime and their string representation is inserted directly into the string.

Prior to fstrings, developers often used the .format() method or the % operator for string formatting. While these methods are still functional, fstrings offer a more direct and intuitive approach. For example, to embed a variable `name` and a variable `age` into a string, one might write `f"My name is {name} and I am {age} years old."`. This eliminates the need to explicitly call formatting methods, leading to cleaner code.

Fstrings can also include more complex expressions, such as function calls or arithmetic operations, within the curly braces. For instance, `f"The result is {2 * 5}"` would evaluate to `f"The result is 10"`. This flexibility makes fstrings a powerful tool for dynamic string creation. They are generally considered faster than older formatting methods, contributing to their popularity among Python developers.