#coding:utf-8

# (1)把数据返回到函数调用处

def func():

    # return  1

    # return "aaabb"

    return [1,2,3,4]

res = func()

print(res)

# 这个地方是调用处 函数名()

res = func()

print(res)

print("<===>")

# (2)函数返回值不是必须,按照需求来,如果不写return 返回值,默认返回None

def func():

    print(12345666)

    # return 12345666

res = func()

print(res)

# 打印1234567 和 自定义的return 之间没有半毛钱关系,返回值是自定义的;

res = print(1234567)

print(res)

print("<=====>")

# (3) 写一个计算器

def calc(sign,num1,num2):

    if sign == "+":

        res = num1 + num2

    elif sign == "-":

        res = num1 - num2

    elif sign == "*":

        res = num1 * num2

    elif sign == "/":

        if num2 == 0:

            return "抱歉，大兄弟，这个算不了"

        res = num1 / num2

    else:

        return "你是外星来的小baby么"

    return res

res = calc("/",5,10)

print(res)