return 返回值的用法

#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)