装饰器的修订

# import time
#
# def index():
#     time.sleep(3)
#     print(‘Welcome to China‘)
# def timmer(func):
#     def inner():
#         start = time.time()
#         func()
#         stop = time.time()
#         print(‘run time is %s‘ % (stop - start))
#     return inner
#
# index=timmer(index)
# index()
‘‘‘
Welcome to China
run time is 3.0002970695495605
‘‘‘
# 装饰器语法：在被装饰对象正上方一行单独写上@装饰器名
# import time
# def timmer(func):
#     def inner():
#         start = time.time()
#         func()
#         stop = time.time()
#         print(‘run time is %s‘ % (stop - start))
#     return inner
# @timmer # 把@装饰器正下方的函数名当作参数传给@装饰器名，并把结果重新命名给index
# def index():
#     time.sleep(3)
#     print(‘Welcome to China‘)
#
# index()
‘‘‘
Welcome to China
run time is 3.000959634780884
‘‘‘
# import time
# def timmer(func):
#     def inner():
#         start = time.time()
#         res=func()
#         stop = time.time()
#         print(‘run time is %s‘ % (stop - start))
#         return res
#     return inner
# @timmer
# def index():
#     time.sleep(1)
#     print(‘Welcome to China‘)
#     return 521
#
# res=index()
# print(res)
‘‘‘
Welcome to China
run time is 1.0006263256072998
521
‘‘‘
# import time
# def timmer(func):
#     def inner(*args,**kwargs):
#         start = time.time()
#         res=func(*args,**kwargs)
#         stop = time.time()
#         print(‘run time is %s‘ % (stop - start))
#         return res
#     return inner
# @timmer
# def home(name):
#     print(‘Welcome %s to China‘%name)
#
# home(‘Rambo‘)
‘‘‘
Welcome Rambo to China
run time is 0.0
‘‘‘
# 有参装饰器
# import time
# def auth(func):
#     # func=index
#     def inner(*args,**kwargs):
#         name=input(‘>>:name‘).strip()
#         password=input(">>:paseword").strip()
#         if name == "Rambo" and password == ‘123‘:
#             print(‘登录成功‘)
#             return func(*args,**kwargs)
#         else:
#             print(‘用户名或者密码错误‘)
#     return inner
# @auth
# def index(name):
#     time.sleep(1)
#     print(‘Welcome %s to China‘%name)
#     return 521
#
# res=index(‘Rambo‘)
# print(res)

装饰器的修订

原文：https://www.cnblogs.com/0B0S/p/11979341.html