Python · Syntax and control flow

Type hints

Optional annotations read by tools and editors. They are not enforced at runtime.

pythonRunnable example python course

Syntax

def f(name: str) -> str:

Example

Open in the lab

def greet(name: str, times: int = 1) -> str:
    return f"Hello, {name}! " * times
print(greet("Ada", 2))

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.