在python中操作返回值

def add(a, b):
    return a + b

result = add(3, 5)
print(result)  # 输出 8

def get_user_info():
    name = "John"
    age = 25
    return name, age

user_name, user_age = get_user_info()
print(user_name)  # 输出 "John"
print(user_age)  # 输出 25

def print_message(message):
    print(message)

print_message("Hello, world!")  # 不需要接收返回值

def check_number(num):
    if num > 0:
        return "Positive"
    elif num < 0:
        return "Negative"
    else:
        return "Zero"

result = check_number(10)
if result == "Positive":
    print("The number is positive.")
elif result == "Negative":
    print("The number is negative.")
else:
    print("The number is zero.")