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Asked: 2026-06-09T18:31:09+00:00

From this block of code: class MainHandler(webapp2.RequestHandler): def get(self): template_values = {given_sentence:’put a sentence

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From this block of code:

class MainHandler(webapp2.RequestHandler):
    def get(self):

        template_values = {"given_sentence":'put a sentence here'}
        template = jinja_environment.get_template('index.html')
        self.response.out.write(template.render(template_values))

    def post(self):
        nb = naivebayes(getfeatures)
        sampletrain(nb)
        given_sentence = self.request.get("given_sentence").encode('utf-8')
      #  given_sentence = self.request.get("given_sentence")
        spam_result = nb.classify(given_sentence)
        submit_button = self.request.get("submit_button")
        if submit_button:
            self.redirect('/test_result?spam_result=%s&given_sentence=%s' % (spam_result, given_sentence))

I’m getting this error:

  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1536, in __call__
    rv = self.handle_exception(request, response, e)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1530, in __call__
    rv = self.router.dispatch(request, response)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "C:\Users\CG\Desktop\Google Drive\Sci&Tech\projects\naivebayes\main.py", line 262, in post
    self.redirect('/test_result?spam_result=%s&given_sentence=%s' % (spam_result, given_sentence))
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 608, in redirect
    response=self.response)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1767, in redirect
    uri = str(urlparse.urljoin(request.url, uri))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 82: ordinal not in range(128)
INFO     2012-08-16 20:02:52,229 dev_appserver.py:2952] "POST / HTTP/1.1" 500 -
INFO     2012-08-16 20:05:06,858 py_zipimport.py:148] zipimporter('C:\\Python27\\lib\\site-packages\\pyyaml-3.10-py2.7-win32.egg', '')
ERROR    2012-08-16 20:05:08,230 webapp2.py:1553] 'ascii' codec can't decode byte 0xc3 in position 16: ordinal not in range(128)
Traceback (most recent call last):
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1536, in __call__
    rv = self.handle_exception(request, response, e)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1530, in __call__
    rv = self.router.dispatch(request, response)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2\webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "C:\Users\CG\Desktop\Google Drive\Sci&Tech\projects\naivebayes\main.py", line 262, in post
    self.redirect('/test_result?spam_result=%s&given_sentence=%s' % (spam_result, given_sentence))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 16: ordinal not in range(128)

When the value of given_sentence is something like this: productos farmacéuticos comprar ahora.

I my python code is in utf-8. I also put on my templates (in the <head> tag) this line: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>.

The problem seens to be in passing a non-ASCII sentence through the url. If I try this (“productos comprar ahora”), it’s ok: 

http://localhost:8084/test_result?spam_result=good&given_sentence=productos%20comprar%20ahora

But If I try this: “productos farmacéuticos comprar ahora” I got the above error. Isn’t it possible to pass through url a non-ASCII value? Or is there some other mistake here that I’m not seeing?

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1 Answer

  1. Editorial Team

    This is a basic Python encoding issue. You are trying to put a non-ASCII string into an ASCII one. Use unicode instead (note the u):

    self.redirect(u'/test_result?spam_result=%s&given_sentence=%s' % (spam_result, given_sentence))

    (and drop the encode call on getting given_sentence).

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