Type Hinting

Type hinting is where you specify the class type that a variable will be, for instance, str.

This is mostly for documentation, though it will help with readability and understanding of the code.

Argument Type

To specify the type of an argument, add a colon after the name and then the class type.

def greet(name: str):
    print("Hello, " + name + "!")

greet("Monty")

The type of the returned value can be specified by adding an arrow after the function, followed by the class type and then the colon.

def sum(num1, num2) -> int:
    return num1 + num2

print(sum(1, 2))

Defining the variable type is very similar to an argument type, in fact, exactly the same.

my_var: str = "Hello"

Last updated 5 years ago