Python实现的文本简单可逆加密算法示例

# -*-coding:utf-8 -*-
import sys
reload(sys)
sys.setdefaultencoding('utf8')
#加密
def jiami():
  filename=raw_input('please input file:\n')
  while True:
    try:
      password=int(raw_input('input number pass word:\n'))
      break
    except:
      print 'please input number:\n'
  fileword=open(filename,'r')
  num=filename.rfind('.')
  newfilename=filename[:num]+'[加密]'.encode('gbk')+filename[num:]
  content=fileword.read(1)
  newfileword=open(newfilename,'a+')
  while len(content)>0:
    contentInt=ord(content)
    newContent=contentInt+password
    c=chr(newContent)
    newfileword.write(c)
    content=fileword.read(1)
  newfileword.close()
  fileword.close()
#解密
def jiemi():
  filename=raw_input('please input file:\n')
  while True:
    try:
      password=int(raw_input('input number pass word:\n'))
      break
    except:
      print 'please input number:\n'
  fileword=open(filename,'r')
  num=filename.rfind('.')
  num2=filename.rfind('[')
  newfilename=filename[:num2]+'[解密]'.encode('gbk')+filename[num:]
  content=fileword.read(1)
  newfileword=open(newfilename,'a+')
  while len(content)>0:
    contentInt=ord(content)
    newContent=contentInt-password
    c=chr(newContent)
    newfileword.write(c)
    content=fileword.read(1)
  newfileword.close()
  fileword.close()
while True:
  index=int(raw_input('---请输入命令,1为加密 2为解密 3为退出---\n'.encode('gbk')))
  if index==1:
    jiami()
  elif index==2:
    jiemi()
  elif index==3:
    exit(0)
else:
    pass