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

#coding=utf-8


def ioerror1(fun):
    def ioerror2(docment):
        try:
            fun(docment)
        except IOError:
            print("File is missing!")
    return ioerror2

def valueerror1(fun):
    def valueerror2(docment):
        try:
            fun(docment)
        except ValueError:
            pass
    return valueerror2

@ioerror1
@valueerror1
def said(docment):
    with open(docment) as data:
        for each_line in data:
            (role,spoken) = each_line.split(':',1)
            print(role,end='')
            print('said:',end='')
            print(spoken,end='
')

said('E:pyHeadFirstPythonchapter3sketch.txt')

装饰类函数，只要在内部函数添加self变量

import os


def excute_all(func):
    def wrapper(self, *args, **kwargs):
        xlsx_list = os.listdir(path='..//Data//')
        for xlsx in xlsx_list:
            if ".xlsx" in xlsx and "~" not in xlsx:
                self.xlsx = xlsx
                print("正在执行" + self.xlsx)
                func(self, *args, **kwargs)
    return wrapper


class TestSplit(object):
    def __init__(self):
        pass

    @excute_all
    def entrust(self):
        print(self.xlsx[:-5] + '.log')


if __name__ == '__main__':
    a = TestSplit()
    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

def get_db_info1(db_remark):
    def real_func(fun2):
        def handle_func(*args, **kwargs):
            print("$$$$$$$$$$$$db_name$$$$$$$$$$$$$", db_remark)
            kwargs["host"] = "10.139.60.156"
            kwargs["user"] = "user"
            kwargs["password"] = "password"
            fun2(*args, **kwargs)

        return handle_func

    return real_func


@get_db_info1(db_remark="mysql156")
def execute_sql_list2(*args, **kwargs):
    # print("###########sql#############", sql)
    print(kwargs['host'])
    print(kwargs['user'])
    print(kwargs["password"])
    for key in args:
        print(key)


if __name__ == '__main__':
    execute_sql_list2("sql_list")

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

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