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Functions & basics

Reusable building blocks — parameters, returns, scope, and clear function design.

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Functions & basics easy

How to Use the if __name__ == '__main__' Guard in Python

This code defines reusable functions and uses the standard main guard to run them only when the script is executed directly, not when imported.

main guard __main__ script entry point
Python 
def greet(name: str) -> str:
    """Return a friendly greeting."""
    return f"Hello, {name}!"

def get_planet() -> str:
    """Return the name of our planet."""
    return "Earth"

if __name__ == "__main__":
    user = "Dorothy"
    print(greet(user))
    print(f"We live on {get_planet()}.")
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