python 函数的定义和应用

1，函数定义和使用：

def  substract(sub_a,sub_b):
    sub_res =sub_a - sub_b
    return sub_res

sub_test = substract(10,20)
print("sub_test=", sub_test)

def multply(mul_a,mul_b):
    mul_res = mul_a * mul_b
    return mul_res

mul_test = multply(2,4)
print("mul_test=",mul_test)


def add(add_a,add_b):
    add_res = add_a + add_b
    return add_res

add_test = add(10,40)
print ("add_test=",add_test)


def devide(dev_a,dev_b):
    try:
        div_res = dev_a / dev_b
    except Exception :
        print("An exception happend :")
    return div_res

div_test = devide(10,10)
print("dev_test=",div_test)

2，运行结果：