ImportError: django.utils not found in Google app engine
Question: I get this error when I use simplejson from django.utils in google app engine
project:

    
    
    Traceback (most recent call last):
      File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 187, in Handle
        handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
      File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 225, in _LoadHandler
        handler = __import__(path[0])
      File "/base/data/home/apps/s~testapp/1.359839747994604729/notify.py", line 8, in <module>
        from handlers.xmpp_handler import XMPPHandler
      File "/base/data/home/apps/s~testapp/1.359839747994604729/handlers/xmpp_handler.py", line 12, in <module>
        import commands
      File "/base/data/home/apps/s~testapp/1.359839747994604729/handlers/commands.py", line 4, in <module>
        from django.utils import simplejson
    ImportError: No module named django.utils
    

**Snippet:**

    
    
    import datetime
    from google.appengine.api import users
    from google.appengine.ext import db
    from django.utils import simplejson
    
    class jsonEncoder(simplejson.JSONEncoder):
        def default(self, obj):
            if isinstance(obj, datetime.datetime):
                return obj.isoformat()
    
            elif isinstance(obj, db.Model):
                return dict((p, getattr(obj, p)) 
                            for p in obj.properties())
    
            elif isinstance(obj, users.User):
                return obj.email()
    
            else:
                return simplejson.JSONEncoder.default(self, obj)
    


Answer: You need to specify that you want to use django in your `app.yaml`:

    
    
    libraries:
    - name: django
      version: "1.2"
    

See the [GAE
docs](https://developers.google.com/appengine/docs/python/tools/libraries27)
for the supported django versions.

On Python 2.7 runtime, you should be using python's [native json
library](https://developers.google.com/appengine/docs/python/python27/newin27#JSON_Version)
instead of simplejson though.

