允许输入输出参数的默认值

def greet(name="World"):
    return f"Hello, {name}!"

print(greet())        # 输出: Hello, World!
print(greet("Alice")) # 输出: Hello, Alice!

function greet(name = "World") {
    return `Hello, ${name}!`;
}

console.log(greet());        // 输出: Hello, World!
console.log(greet("Alice")); // 输出: Hello, Alice!

def greet(name="World", greeting="Hello"):
    print(f"greeting: {greeting}, name: {name}")
    return f"{greeting}, {name}!"

print(greet())        # 输出: greeting: Hello, name: World
print(greet("Alice")) # 输出: greeting: Hello, name: Alice
print(greet(greeting="Hi")) # 输出: greeting: Hi, name: World