def deco(func):def wrapper(*args,**kwargs):编写基于文件的认证,认证通过则执行res=func(*args,**kwargs),并返回resreturn wrapper

def auth(func,db_type):def wrapper(*args, **kwargs):name=input('your name>>>: ').strip()pwd=input('your password>>>: ').strip()if db_type == 'file':print('基于文件的验证')if name == 'egon' and pwd == '123':res = func(*args, **kwargs)return reselse:print('user or password error')elif db_type == 'mysql':print('基于mysql的验证')elif db_type == 'ldap':print('基于ldap的验证')else:print('不支持该db_type')return wrapper

def auth(db_type):def deco(func):def wrapper(*args, **kwargs):name = input('your name>>>: ').strip()pwd = input('your password>>>: ').strip()if db_type == 'file':print('基于文件的验证')if name == 'egon' and pwd == '123':res = func(*args, **kwargs)  # index(1,2)return reselse:print('user or password error')elif db_type == 'mysql':print('基于mysql的验证')elif db_type == 'ldap':print('基于ldap的验证')else:print('不支持该db_type')return wrapperreturn deco

def timer(func):def wrapper(*args,**kwargs):start_time=time.time()res=func(*args,**kwargs)stop_time=time.time()print('run time is %s' %(stop_time-start_time))return reswrapper.__doc__=func.__doc__wrapper.__name__=func.__name__return wrapper

from functools import wrapsdef timer(func):@wraps(func)def wrapper(*args,**kwargs):start_time=time.time()res=func(*args,**kwargs)stop_time=time.time()print('run time is %s' %(stop_time-start_time))return resreturn wrapper

#参数1 : 给修饰的类添加成员属性和方法
#参数2 : 给类中的run方法变成属性class Kuozhan():ad = "我是属性"def char(self):print("我是方法")def __init__(self,num):self.num = numdef __call__(self,cls):print(cls)if self.num == 1:return self.kuozhan1(cls)elif self.num == 2:return self.kuozhan2(cls)#参数1的情况:添加成员属性和方法def kuozhan1(self,cls):def newfunc():cls.ad = Kuozhan.adcls.money = Kuozhan.moneyreturn cls()return newfunc#参数2的情况:把方法变成属性def kuozhan2(self,cls):def newfunc():if "run" in cls.__dict__:cls.run = cls.run()return cls()return newfunc
#
@Kuozhan(1)
class MyClass():def run():return "运动"
obj = MyClass()
print(obj.ad)
obj.money()#
@Kuozhan(2)
class MyClass():def run():return "运动"
obj = MyClass()
print(obj.run)

class MyClass():def __init__(self,name):self.name = name@propertydef username(self):return self.name@username.setterdef username(self,val):self.name = valpass@username.delsterdef username(self):def self.namepass
obj = MyClass("小红")
获取指的时候自动触发@property 装饰器下的方法
res = obj.username
print(res)#设置值的时候自动触发@username.setter装饰器下的方法
obj.username = "小白"
print(obj.username)

class Myclass():def __init__(self,name):self.name = name #获取数据def get_username(self):return self.name#设置数据def set_username(self,val):self.name = val#删除数据def del_username(self):del self.name#参数的顺序:获取,设置,删除username = property(get_username, set_username, del_username)obj = MyClass("小白")
#获取值的时候,执行get_username下的相关操作
print(obj.username)
#设置值的时候,执行set_username下的相关操作
print(obj.username)
#删除值的时候,执行del_username下的相关操作
del obj.username
print(obj.username)

l=['egon','liu','alex']i=0while i < len(l):print(l[i])i+=1

1、d.__iter__()得到一个迭代器对象
2、迭代器对象.__next__()拿到一个返回值，然后将该返回值赋值给k
3、循环往复步骤2，直到抛出StopIteration异常for循环会捕捉异常然后结束循环

def func():print('第一次')yield 1print('第二次')yield 2print('第三次')yield 3print('第四次')触发函数体代码的运行，然后遇到yield停下来，将yield后的值
当做本次调用的结果返回
res1=g.__next__()
print(res1)