Question

I’m having problems with Webapp2. When I put handlers for URLs that point to different python files in the app.yaml I get the following error:

ERROR    2012-10-06 16:44:57,759 wsgi.py:203] 
Traceback (most recent call last):
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 195, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 250, in _LoadHandler
    __import__(cumulative_path)
ImportError: No module named application

My app.yaml:

application: [[app's name]]
version: 1
runtime: python27
api_version: 1
threadsafe: yes

inbound_services:
- mail

handlers:

- url: /send
  script: email.application

- url: /_ah/mail/[e-mail].*
  script: email.application

- url: /.*
  script: SDSUmodels.application

libraries:
- name: webapp2
  version: "2.5.1"

SDSUmodels.py ends with:

application = webapp2.WSGIApplication([('/info', MakeBasicInfo)], 
                                   debug=True)`

and email.py ends with:

application = webapp2.WSGIApplication([('/request', Request_update),
                                   ('/send', Send_report),
                                   (Receive_email.mapping())], 
                                   debug=True)`

When I remove these lines

- url: /send
  script: email.application

from app.yaml, the error stops, but this leaves me without a way to point a URL towards a particular file.

I can see some alternative ways of handling this in this question but I was wondering why this approach isn’t working. I’ve done this previously with the old webapp version in a different project and it’s worked – details below.

app.yaml:

application: [[other app's name]]
version: 1
runtime: python
api_version: 1

handlers:
- url: /stylesheets
  static_dir: stylesheets

- url: /twitter
  script: twitter.py

- url: /_ah/mail/[e-mail].*
  script: kindle.py

- url: /.*
  script: web.py

inbound_services:
- mail

twitter.py ends with:

application = webapp.WSGIApplication(
                                     [('/twitter', Process_new_DM)],
                                     debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

Answer 1

There is a standard library named email as well; it is being loaded before your local module is being found.

Rename the module to something else and it’ll work.