定制自己的数据类型

#继承"""class LIST(list):    def append(self, p_object):        if not isinstance(p_object,int):            raise TypeError(‘must be int‘)        super().append(p_object)

def insert(self, index, p_object):        if not isinstance(p_object,int):            raise TypeError(‘must be int‘)        super().insert(index,p_object)

li =LIST([1,2,3])print(li)#li.append(‘2‘)li.append(4)print(li)li.insert(0,-10)print(li)#li.insert(0,‘-1‘)print(li)"""#授权import timeclass Open:    def __init__(self,filepath,m=‘w+‘,encode=‘utf-8‘):        self.filepath =filepath        self.mode =m        self.encoding =encode        self.x =open(filepath,mode =m,encoding=encode)    def write(self,line):        t =time.strftime(‘%Y-%m-%d %X‘)        self.x.write(‘%s  %s‘%(t,line))

def __getattr__(self, item):        print(‘%s %s‘%(self,item))#getattr(self.x,item),中的item是字符串        return getattr(self.x,item)#把它转化成self.x.item(属性),        #print(‘%s  %s‘(self))f =Open(‘a‘)f.write(‘12112121\n‘)f.write(‘121212121\n‘)f.seek(0)print(f.read)#查询f.read,但是没有找到,f.read,所以就触发__getattr__方法