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Editorial Team
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Asked: 2026-05-27T06:37:43+00:00

When I run this code in the dev_appserver it gives me the Invalid syntax

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When I run this code in the dev_appserver it gives me the “Invalid syntax” error at line 22, where the HugAPanda class is initialized. Does anybody know why this would happen? Here’s the code:

import wsgiref.handlers
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app

class PandasHugs(db.Model):
  message = db.IntegerProperty()

class MainPage(webapp.RequestHandler):
    def get(self):
        ListOfHugs = db.GqlQuery("SELECT * FROM PandasHugs")
        Adder = 0
        for PandasHugs in ListOfHugs:
            Adder = Adder + 1
        self.response.out.write('<html><body>')
        self.response.out.write('<h6>Panda has ' + str(Adder) + ' hugs!</h6>')
        self.response.out.write("<form action=\"/HugPanda\" method=\"post\"><div><input type=\"text\" name=\"PandaMessage\" value=\"A message for a panda.\"></div><div><input type=\"submit\" value=\"Hug a panda?\"></div></form></body></html>">


class HugAPanda(webapp.RequestHandler):
    def post(self):
        HugForAPanda = PandaHugs()
        HugForAPanda.message = self.request.get('PandaMessage')
        HugForAPanda.put()
        self.redirect('/main')

application = webapp.WSGIApplication(
  [('/', MainPage), ('/main', MainPage), ('/HugPanda', HugAPanda)],
  debug=True)

def main():
  run_wsgi_app(application)

if __name__ == "__main__":
  main()

Thanks again!
-Neil

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1 Answer

  1. Editorial Team

    You have invalid syntax in a line above. (Line 15 it looks like)

    self.response.out.write("<form action=\"/HugPanda\" method=\"post\"><div><input type=\"text\" name=\"PandaMessage\" value=\"A message for a panda.\"></div><div><input type=\"submit\" value=\"Hug a panda?\"></div></form></body></html>">

    Extra ‘>’ at the end should be replace with ‘)’.

    This is a very good reason to follow python convention and limit line length to 79 characters. I won’t argue with going up to 120 if that is standard at your organization, but it certainly should not be written the way it’s presented here 🙂

    In this case I’d recommend writing readable html code (ie. properly indented) in triple quotes. In your case I would use single triple quotes so you do not have to escape every “. I just recommend the single quotes here to avoid confusion, but I believe “”” will also work in this case.

    ie.

    self.response.out.write('''<html>
  <body>
    <h6>Panda has %s hugs!</h6>
      <form action="/HugPanda" method="post">
        <div>
          <input type="text" name="PandaMessage" value=
          "A message for a panda.">
        </div>
        <div>
          <input type="submit" value="Hug a panda?">
        </div>
      </form>
  </body>
</html>''' % Adder)

    Just noticed some errors in the html after rewriting your code should have ‘/>’ to close your input tags. Good style can go a long way in avoiding errors without the use of any tools!

    http://www.python.org/dev/peps/pep-0008/

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