python_typing_basics_with_generic_collections_and_type_aliases.py

1from typing import List, Dict, Tuple
2
3def greeting(name: str) -> str:
4    return 'Hello ' + name
5
6# Vector is a list of floats
7Vector = List[float]
8
9def scale(scalar: float, vector: Vector) -> Vector:
10    return [scalar * num for num in vector]
11
12# A dictionary where keys are strings and values are integers
13counts: Dict[str, int] = {"apple": 1, "banana": 2}
14
15# A tuple containing a string, an integer, and a float
16person: Tuple[str, int, float] = ("Alice", 30, 5.5)
17
18if __name__ == "__main__":
19    print(greeting("World"))
20    
21    new_vector = scale(2.0, [1.0, 2.0, 3.0])
22    print(new_vector)