title: Error Python 2.7 on Google App Engine - Threadsafe cannot be enabled with CGI handler
body: <p>I have tried to move to Python 2.7 from Python 2.5 but I keep getting the same error everytime.</p>
  
  <p>I have made a very simple test in Python 2.5 working with the app.yaml file and just one script main.py and it works fine. The script it just a Hello World type to check everythin works fine.</p>
  
  <p>app.yaml</p>
  
  <pre><code>application: sparepartsfinder
  version: 1
  runtime: python
  api_version: 1
  
  
  handlers:
  
  - url: /blog
    script: main.py
  
  - url: /blog/new_entry
    script: main.py 
  </code></pre>
  
  <p>main.py</p>
  
  <pre><code>from google.appengine.ext import webapp
  from google.appengine.ext.webapp.util import run_wsgi_app
  
  class MainPage(webapp.RequestHandler):
      def get(self):
          self.response.headers['Content-Type'] = 'text/plain'
          self.response.out.write('Hello, webapp World!')
  
  application = webapp.WSGIApplication(
                                       [('/', MainPage),
                                        ('/blog', MainPage),
                                        ('/blog/new_entry',MainPage),
                                        ('/blog/archive/.*',MainPage)],
                                       debug=True)
  
  def main():
      run_wsgi_app(application)
  
  if __name__ == "__main__":
      main()
  </code></pre>
  
  <p>When I change to Python 2.7 I follow the documents on the <a href="https://developers.google.com/appengine/docs/python/python27/using27#Configuring_the_Application" rel="noreferrer">Google App Engine</a> to the letter making the changes in both the app.yaml and main.py script. </p>
  
  <p>app.yaml</p>
  
  <pre><code>application: sparepartsfinder
  version: 1
  runtime: python27
  api_version: 1
  threadsafe: true
  
  
  handlers:
  
  - url: /blog
    script: main.py
  
  - url: /blog/new_entry
    script: main.py 
  
  - url: /blog/archive/.*
    script: main.py
  
  
  - url: .*
    script: main.py
  </code></pre>
  
  <p>main.py</p>
  
  <pre><code>import webapp2
  
  class MainPage(webapp2.RequestHandler):
      def get(self):
          self.response.out.write('Hello prueba!')
  
  app = webapp2.WSGIApplication([('/', MainPage),
                                 ('/blog', MainPage),
                                 ('/blog/new_entry',MainPage),
                                 ('/blog/archive/.*',MainPage)],
                                debug=True)
  </code></pre>
  
  <p>Unfortunately it doesn't work either in local or when I try to upload the new configuration to the Google App Engine. ( I get always the same mistake).</p>
  
  <p>I may understand the problem in my machine ( I have both Python 2.5 and 2.7 ) on a Windows XP, but not when I upload.</p>
  
  <p>This is the error:</p>
  
  <blockquote>
    <p>2012-05-04 13:02:07 Running command: "[u'C:\Python25\python2.5.exe', '-u', 'C:\Archivos >de programa\Google\google_appengine\appcfg.py', '--no_cookies', u'--email=salvador.sanjuan@gmail.com', '--passin', 'update', 'C:\Documents and Settings\SSanjuan\Mis documentos\Dropbox\Dropbox\Python\SpareParts']"
    Error parsing yaml file:
    Invalid object:
    threadsafe cannot be enabled with CGI handler: main.py
      in "C:\Documents and Settings\SSanjuan\Mis documentos\Dropbox\Dropbox\Python\SpareParts\app.yaml", line 27, column 1
    2012-05-04 13:02:31 (Process exited with code 1)</p>
  </blockquote>