udacity-web development-homework(unit2-rot13)

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本文介绍了一个简单的ROT13加密解密Web应用程序。该程序使用Python编写，并通过Google App Engine部署。用户可以在网页中输入文本，程序将对其进行ROT13加密或解密并显示结果。

gae http://rot13-fxj.appspot.com/

import webapp2, cgi

form="""
<html>
  <head>
    <title>Unit 2 Rot 13</title>
  </head>

  <body>
    <h2>Enter some text to ROT13:</h2>
    <form method="post">
      <textarea name="text"
                style="height: 100px; width: 400px;">%(answer)s</textarea>
      <br>
      <input type="submit">
    </form>
  </body>

</html>
"""


class MainPage(webapp2.RequestHandler):
    def get(self):
        self.response.write(form % {'answer': ''}) 

    def post(self):
        content = self.request.get('text')
        output = cgi.escape(self.rot13(content), quote = True)
        self.response.write(form % {'answer': output    })

    def rot13(self,string):
        ret = ''
        for i in string:
            if ord(i) >= ord('a') and ord(i) <= ord('z'):
                ret += chr((ord(i)-ord('a')+13)%26+ord('a'))
            elif ord(i) >= ord('A') and ord(i) <= ord('Z'):
                ret += chr((ord(i)-ord('A')+13)%26+ord('A'))    
            else:
                ret += i
        return ret
                
app = webapp2.WSGIApplication([('/', MainPage)], debug=True)