Python Type Hints: A Practical Beginner's Guide

Type hints don't change how Python runs your code. They change how you read it, debug it, and catch bugs before they happen.

Here's everything you need to start using them effectively.

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The basics: annotating variables and functions

# Variables name : str = " Alice " age : int = 30 price : float = 9.99 active : bool = True

# Functions def greet ( name : str ) -> str : return f " Hello, { name } ! "

def add ( a : int , b : int ) -> int : return a + b

def log_event ( message : str ) -> None : print ( f " [LOG] { message } " ) # returns None, so -> None

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The syntax: parameter: type for inputs, -> type for the return value.

Python does not enforce these at runtime — they're hints for your IDE, linter, and teammates. greet(42) won't raise an error.…