深入理解python类装饰器和带参数装饰器

装饰器wapper函数可以使用fun的参数，并且可以给fun传递不一样的参数

def deco(func):
    def wrapper(a, b):
        print(a)
        startTime = time.time()
        c = a + 1
        func(c, b)
        endTime = time.time()
        msecs = (endTime - startTime) * 1000
        print("time is %d ms" % msecs)

    return wrapper


@deco
def func(a, b):
    print("hello，here is a func for add :")
    time.sleep(1)
    print("result is %d" % (a + b))


if __name__ == '__main__':
    f = func
    f(3, 4)
    # func()

使用装饰器处理异常
多个装饰器从上到下执行

 1 #coding=utf-8
 2 
 3 
 4 def ioerror1(fun):
 5     def ioerror2(docment):
 6         try:
 7             fun(docment)
 8         except IOError:
 9             print("File is missing!")
10     return ioerror2
11 
12 def valueerror1(fun):
13     def valueerror2(docment):
14         try:
15             fun(docment)
16         except ValueError:
17             pass
18     return valueerror2
19 
20 @ioerror1
21 @valueerror1
22 def said(docment):
23     with open(docment) as data:
24         for each_line in data:
25             (role,spoken) = each_line.split(':',1)
26             print(role,end='')
27             print('said:',end='')
28             print(spoken,end='\n')
29 
30 said('E:\py\HeadFirstPython\chapter3\sketch.txt')

装饰类函数，只要在内部函数添加self变量

 1 import os
 2 
 3 
 4 def excute_all(func):
 5     def wrapper(self, *args, **kwargs):
 6         xlsx_list = os.listdir(path='..//Data//')
 7         for xlsx in xlsx_list:
 8             if ".xlsx" in xlsx and "~" not in xlsx:
 9                 self.xlsx = xlsx
10                 print("正在执行" + self.xlsx)
11                 func(self, *args, **kwargs)
12     return wrapper
13 
14 
15 class TestSplit(object):
16     def __init__(self):
17         pass
18 
19     @excute_all
20     def entrust(self):
21         print(self.xlsx[:-5] + '.log')
22 
23 
24 if __name__ == '__main__':
25     a = TestSplit()
26     a.entrust()

参考：https://blog.csdn.net/xiangxianghehe/article/details/77170585
      http://www.cnblogs.com/sysnap/p/6599140.html
装饰器带参数，函数带参数

 1 def get_db_info1(db_remark):
 2     def real_func(fun2):
 3         def handle_func(*args, **kwargs):
 4             print("$$$$$$$$$$$$db_name$$$$$$$$$$$$$", db_remark)
 5             kwargs["host"] = "10.139.60.156"
 6             kwargs["user"] = "user"
 7             kwargs["password"] = "password"
 8             fun2(*args, **kwargs)
 9 
10         return handle_func
11 
12     return real_func
13 
14 
15 @get_db_info1(db_remark="mysql156")
16 def execute_sql_list2(*args, **kwargs):
17     # print("###########sql#############", sql)
18     print(kwargs['host'])
19     print(kwargs['user'])
20     print(kwargs["password"])
21     for key in args:
22         print(key)
23 
24 
25 if __name__ == '__main__':
26     execute_sql_list2("sql_list")

参考：https://www.cnblogs.com/sysnap/p/6599140.html

　　　https://www.cnblogs.com/chaojiyingxiong/p/9223754.html