闭包函数、装饰器

def ():
   a = 1
    def nei(): nei函数嵌套在wai函数里
      b = a + 1
        print('这是内部函数, a = %d, b = %d' % (a, b))
     return a
    return nei()

res = wai()
print(res)

这是内部函数, a = 1, b = 2
1
[Finished in 0.1s]

def (func):
    def nei():
        print('这是装饰器函数')
        return func()
    return nei


def work():
    print('这是主函数')

work()


'''
这是装饰器函数
这是主函数
[Finished in 0.1s]
'''

def dec(t): # ----------------------------------------------------装时期函数及其参数
    def (func): # ---------------------------------------------将被装饰函数传入
        def nei(var): # ------------------------------------------将被装饰函数的参数传入
            if t == True: #---------------------------------------识别装时期函数的t参数
                var += 1 
                print("Let's do it.")
            else:
                print("Never mind.")
            return func(var) #------------------------------------调用被装饰函数
        return nei
    return wai

@dec(t = True)
def work(var):
    print(var)

@dec(t = False)
def work_1(var):
    print(var)

work(1)
print('---------------')
work_1(2)

# 执行结果:
'''
Let's do it.
2
---------------
Let's do it.
2
[Finished in 0.1s]
'''