没有在用于 web 开发的 python 程序中获得最终输出

Question

我编写了以下代码来打印字符串的 rot13 代码。 Rot13 代码是将字符串的字母移动 13 位的地方。但是由于某种原因，打印的文本框总是空白的。有人可以帮我处理这段代码吗？

import os
import webapp2
import jinja2
import cgi
import string

template_dir= os.path.join(os.path.dirname(__file__), 'templates')
jinja_env= jinja2.Environment(loader= jinja2.FileSystemLoader(template_dir),
                                                                         autoescape= True) # automatically escapes all the variables


form="""
<form method="post">
      <textarea name="text" style="height: 100px; width: 400px;">%(val)s</textarea>
      <br>
      <input type="submit">
    </form>
"""

class Handler(webapp2.RequestHandler):
    def write(self,*a,**kw):
        self.response.out.write(*a,**kw)

    def render_str(self,template,**params):
        #Causes Jinja to load that file creating jinja template
        t=jinja_env.get_template(template)
        return t.render(params)

    def render(self,template,**kw):
        self.write(self.render_str(template,**kw))



class MainPage(webapp2.RequestHandler):

    def escape_html(self,s):
        return cgi.escape(s, quote=True)

    def write_form(self, s=''):
        self.response.out.write(form % {"val":s})

    def get(self):
        self.write_form()

    def rot13(self, s):
        out=""
        str1 =  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
        str2 = "NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm"
        for c in s:
            if c in str1:
                k = str1.index(c)
                out += string.replace( s,c, str2[k])
            else:
                out += c
        return out

    def post(self):
        user_text = self.request.get('text')
        user_text = self.escape_html(user_text)
        user_text = self.rot13(user_text)


        self.write_form(user_text)


app = webapp2.WSGIApplication([
('/', MainPage)
], debug=True)

Answer 1

你可以使用：

import codecs

然后进入 POST，您可以使用以下方法直接将字符串转换为 rot_13：

text = codecs.encode(user_text, 'rot_13')

这里修改的代码：

import os
import webapp2
import jinja2
import cgi
import string
import codecs

template_dir= os.path.join(os.path.dirname(__file__), 'templates')
jinja_env= jinja2.Environment(loader= 
jinja2.FileSystemLoader(template_dir),

autoescape= True) # automatically escapes all the variables


form="""
<form method="post">
  <textarea name="text" style="height: 100px; width: 400px;">%
  (val)s</textarea>
  <br>
  <input type="submit">
</form>
"""

class Handler(webapp2.RequestHandler):
   def write(self,*a,**kw):
      self.response.out.write(*a,**kw)

   def render_str(self,template,**params):
      #Causes Jinja to load that file creating jinja template
      t=jinja_env.get_template(template)
      return t.render(params)

   def render(self,template,**kw):
      self.write(self.render_str(template,**kw))

class MainPage(webapp2.RequestHandler):

    def escape_html(self,s):
        return cgi.escape(s, quote=True)

    def write_form(self, s=''):
        self.response.out.write(form % {"val":s})

    def get(self):
       self.write_form()

def post(self):
    user_text = self.request.get('text')
    text = codecs.encode(user_text, 'rot_13')
    self.write_form(text)


app = webapp2.WSGIApplication([
('/', MainPage)
], debug=True)

这里是应用运行的结果动画：

编辑： 如果你想使用你的例程：

def rot13(self, s):
    out = ""
    str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
    str2 = "NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm"
    for c in s:
        if c in str1:
            k = str1.index(c)
            #out += string.replace(s, c, str2[k])
            out += str2[k]
        else:
            out += c
    return out