What is the purpose of f in Python?

In Python, f is a special prefix used for string formatting. It is used to create formatted strings that can contain values of variables, expressions, and function calls.

By using f-strings, you can insert the values of variables into a string without explicitly using string formatting methods such as .format(). Instead, you can specify the variable to insert in the string using curly braces ({}) and prefix the variable with the f prefix.

For example, if there is a variable named “name,” you can insert it into a string using f-strings:

name = "Alice"
message = f"Hello, {name}!"
print(message)  # 输出: Hello, Alice!

In the f-string, you can use any valid Python expression inside braces, even perform simple calculations within them.

x = 10
y = 5
result = f"The sum of {x} and {y} is {x + y}"
print(result)  # 输出: The sum of 10 and 5 is 15

By using f-strings, variables and expression values can be inserted into strings more concisely, making the code easier to read and maintain.