python新手，面向对象依赖某个对象编程怎么写合适？

Question

我在网上找了个删除指定时间外的文件的代码，但是是针对单一路径删除的。如下

__author__ = 'Administrator'
import os;
import sys;
import time;

class DeleteLog:
    def __init__(self,filename,days):
        self.filename=filename;
        self.days=days;

    def delete(self):
        if os.path.exists(self.filename)==False:
            print(self.filename+ ' is not exists!!')
        elif os.path.isfile(self.filename):
            print(self.filename);
        elif os.path.isdir(self.filename):
            print(self.filename + ' is a path!');
            for i in [os.sep.join([self.filename,v]) for v in os.listdir(self.filename)]:
                if self.compare_file_time(i) and (os.path.isfile(i)):
                    os.remove(i);
                    print(i+' is removed!');

    def compare_file_time(self,file):
        time_of_last_mod=os.path.getatime(file);
        days_between=(time.time()-time_of_last_mod)/(24*60*60);
        if days_between>self.days:
            return True;
        return False;


if __name__=='__main__':
    path='/u01/app/diag/rdbms/orcl/orcl/trace';
    obj=DeleteLog(path,5);
    obj.delete();

我想做个多路径删除的，然后我想创建一个MultDel类，基于这个DeleteLog类,我是不是要这么写，创建MultDel类的时候就把，DeleteLog传进去？然后以self.DeleteLog 这样？还是不用引用直接在方法中实例化该类就可以？

class MultDel(object):
    """docstring for multDel"""
    def __init__(self, sDel,mpath):
        super(MultDel, self).__init__()
        self.mpath = mpath
        self.sDel
    

请大神指点