print("Hello, world!")

Run the script:

python main.py

This prints a line in Python with the built-in print function. It is the normal first script example.

Python variables are dynamically typed and can be annotated when the expected type matters.

name = "Dan"
age: int = 30
is_active = True

Python lets you bind values without declaring a type first. Add annotations when you want the expected shape to be clearer.

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


message = greet("world")
print(message)

This defines a function with type hints, calls it, and prints the returned value.