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  • python :practice integrated decorator three categories

    python decorator is a crucial(vital,signifiant) process.

    decorator mail two category

    1:principal function no arguments(parameters):

     for example:

     principal function:

    decorator:

    import time

    def logger(flag):

         def decorator():

             def  inner():

              stat_time=time.time()

                func()

               end_time=time_time()

               print(end_time-start_time)

               if flag='true':

                  print('date is ')

             return inner

       return decorator

    @logger('true')

    def test():

          print('hello world')

    2:principal fuction have arguments:

    def logger(flag):

         def decorator():

             def  inner(n):

              stat_time=time.time()

                func(n)

               end_time=time_time()

               print(end_time-start_time)

               if flag='true':

                  print('date is ')

             return inner

       return decorator

    from functools import reduce

    @logger('true')

    def factorial_array(n):

        number=reduce(lambda x,y:x*y,range(1,n+1))

        print(number)

    factorial_array(100)

    3:principal fuction have incert arguments:

    def logger(flag):

         def decorator():

             def  inner( *args,**kwargs):

              stat_time=time.time()

                func(*args,**kwargs)

               end_time=time_time()

               print(end_time-start_time)

               if flag='true':

                  print('date is ')

             return inner

       return decorator

    def add(*args):

        number=0

        for i in args:

           number+=i

         print(number)

    add(1,2,3,4)

    decorator  integrated ,function domain,higher-order function ,closure operation.

               

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  • 原文地址:https://www.cnblogs.com/alansuny/p/12500215.html
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