python文本持久化

今天很懒，就什么都不写啦！过几天不知道我还能不能看懂下面的这些？
import cPickle as cp
import sys

class Person:
    def __init__(self,name,tel):
        self.name = name
        self.tel = tel
    def say(self):
        print 'name:%s \t tel:%s' % (self.name,self.tel)
       
myfriendfile = 'myfriend.data'

def init():
    m = {}
    f = file(myfriendfile,'w')
    cp.dump(m,f,-1)
    f.close()
   
init()

f = file(myfriendfile)
m = cp.load(f)
f.close()

print 'please check mode:\n(a) append \t(d) delete\n(s) save\t(q) quit\n(show) show\n'
while(True):
    check = raw_input('please check mode:')
       
    if check == 'q':
        break

    if check == 'a':       
        m[raw_input('please input key:')]= Person(raw_input('please input name:'),raw_input('please input tel:'))  
        print '(A) currtent length:',len(m)
       
    if check == 'd':
        del m[raw_input('please input key:')]   
        print '(D) currtent length:',len(m)

    if check == 's':
        print '(S) currtent length:',len(m)
        f = file(myfriendfile,'w')
        cp.dump(m,f,-1)
        f.close()

    if check == 'se':
        m[raw_input('please input key:')].say()
        print "I'm looking for you..."
       
    if check == 'show':
        f = file(myfriendfile)
        m = cp.load(f)
        print '------------------ show ------------------'
        for key,value in m.items():
            value.say()
        print '------------------ over ------------------'
        f.close()