Python实现的文本简单可逆加密算法示例

# -*-coding:utf-8 -*-import sysreload(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