letter 

fr=open('letter.txt',mode='r',encoding='utf-8')
plaincode = fr.read()
print('明文:'+plaincode)
print('密文:',end='')

open('letter.txt',mode='r',encoding='utf-8')
for c in plaincode:
    print(chr

(ord(c)+3),end='')
posted @ 2018-05-30 20:48  吴树生  阅读(230)  评论(0)  编辑  收藏  举报