2-Minute Python Guide: Type Hints (2026)

2-Minute Python Guide: Type Hints
Type hints in Python are a powerful tool to improve code readability and maintainability. They allow you to specify the expected types of variables, function parameters, and return values. In this guide, we'll cover the basics of type hints in Python.

You can add type hints to variables using the syntax variable: type. For example, name: str indicates that the name variable should be a string. Function signatures can also include type hints for parameters and return values, such as def greet(name: str) -> None.

The Optional type is used to indicate that a value can be either a specific type or None. For example, name: Optional[str] means name can be either a string or None. You can also use list and dict to hint at the types of lists and dictionaries. The Union type allows you to specify multiple possible types for a variable.

Here's an example code block:

from typing import Optional, Union, List, Dict

def greet(name: Optional[str]) -> None:
    if name:
        print(f"Hello, {name}!")
    else:
        print("Hello!")

# Example usage:
greet("Alice")  # Hello, Alice!
greet(None)    # Hello!

Takeaway: Type hints are a simple yet effective way to make your Python code more readable and self-documenting. By using type hints, you can improve the maintainability of your code and catch type-related errors early. Start using type hints in your Python projects today!

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