变量类型：

name: str = "Alice"

age: int = 30

height: float = 1.75

is_student: bool = False

注解：

def add(a: int, b: int) -> int:

    return a + b

def greet(name: str) -> None:

    print(f"Hello, {name}")

定义矩形类：

class Rectangle:

    width: float      

    height: float     

    def __init__(self, width: float, height: float):

        self.width = width

        self.height = height

    def area(self) -> float:@浙大疏锦行

        return self.width * self.height