ImportError: No module named django.core.handlers.wsgi

[Mak Ahmad]

Hi I'm getting the following error and cannot find anything in the forums that has helped me with AppEngine:

ImportError: No module named django.core.handlers.wsgi 

Here's my code

import os

os.environ['DJANGO_SETTINGS_MODULE'] = 'app.settings'

#import sys

#sys.path.append('lib')

#sys.path.append('//Library/Python/2.7/site-packages/django')

import django.core.handlers.wsgi

from requests_toolbelt.adapters import appengine

appengine.monkeypatch()

application = django.core.handlers.wsgi.WSGIHandler()

I tried manually adding django to the library but that didn't work either. I also tried going to the google_appengine django 1.5 library folder and doing a python setup.py but that didn't work either.

Any thoughs? I know Django is builtin to appengine just don't see where my system path issue is. 

I can do the following with no error

Python 2.7.10 (default, Oct 23 2015, 19:19:21) 

[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> import django

>>> import django.core.handlers.wsgi

[Mak Ahmad]

Forgot to mention, I get that django wsgi error when trying to access http://localhost:8080/

[Adam (Cloud Platform Support)]

You're getting the ImportError because django is not in your sys.path.

If you want to use one of the built-in django versions from the App Engine SDK, simply add this to your app.yaml (it's not necessary to install the Django library separately):

libraries:
- name: django
  version: "1.4"

If you want to include your own django version with your app (eg. to use a recent version > 1.5), don't add the above line and instead install the library directly into your project's root directory:

$ cd myapp/
$ pip install django -t .

If you want to install to a subfolder like 'lib', first add these lines to your app, preferably in appengine_config.py in the root of your project:

from google.appengine.ext import vendor

# Add any libraries installed in the "lib" folder.
vendor.add('lib')

Then install the library:

$ cd myapp/
$ pip install django -t lib/

By default dev_appserver.py excludes local site-packages and it's best to not try and override this, since your app will only work locally and not when deployed.

[Mak Ahmad]

Thank you Adam. I should have shared that I already do have django in my app.yaml

application: xxxxxx-xxxx

version: 1

runtime: python27

api_version: 1

threadsafe: yes

# Handlers match in order, put above the default handler.

handlers:

- url: /static

  static_dir: static

- url: /.*

  script: main.application

libraries:

- name: django

  version: "1.5"

- name: jinja2

  version: "2.6"

- name: markupsafe

  version: "0.15"

- name: ssl

  version: latest

builtins:

- django_wsgi: on

Any thoughts on how I can get the build in django in my sys.path?

[Adam (Cloud Platform Support)]

Are you doing anything else with sys.path anywhere in your code? I'm testing again with only the builtin version of django in app.yaml, and I do not get any ImportErrors.

You should not need to modify sys.path in any way unless you're using an installed version of django somewhere other than the application root. You should use either the built-in django or vendor your own with pip, but not both at the same time.

[Mak Ahmad]

Sorry there's nothing else I'm doing with the sys path. I just deleted my working directory and did pip uninstall django so it uninstalled it from the Python library. I then recloned the working directory with all the sys path code commented and ran the server and still get the same error.

Does Django need to be installed within google python SDK? I know it's built in but is there an additional step needed? 

I am using a Mac by the way 

[Adam (Cloud Platform Support)]

If you are having issues setting up Django on App Engine I'd advise following the officially documented method, as per 'Running Django on App Engine standard environment', which uses a pre-configured 'appengine-django-skeleton' project. This method uses 'pip -t' to vendor the latest Django version into the project.

[Mak Ahmad]

I tried a few things and also tried

http://howto.pui.ch/post/39245389801/tutorial-django-on-appengine-using-google-cloud

with no luck.

So then I used the "Google App Engine Launcher" and added the existing application there and hit start and it worked. For some reason starting the application in a terminal using  "dev_appserver.py XXXX" doesn't work but with the GUI it does

[Adam (Cloud Platform Support)]

I'm glad you were able to get it to work with the launcher. If you get ImportErrors only when starting from the terminal it's possible your Python interpreter is misconfigured. You might want to share the output of the following:

Check which Python interpreter you're using

$ which python

Check your python version

$ python --version

Check any Python environment variables eg. PYTHON_PATH

$ export | grep PYTHON

[Mak Ahmad]

here it is Adam

USERNAME-macbookpro:Documents USERNAME$ which python

/usr/bin/python

USERNAME-macbookpro:Documents USERNAME$ python --version

Python 2.7.10

USERNAME-macbookpro:Documents USERNAME$ export|grep PYTHON

declare -x PYTHONPATH=":/Users/USERNAME/Documents/google_appengine:/Users/USERNAME/Documents/google_appengine/lib/django-1.5"

hope that helps

[Adam (Cloud Platform Support)]

It's not necessary to add any of the App Engine SDK paths to PYTHONPATH for the development server to work. There's also a syntax error (the leading ':'). I'd advise just not setting it at all in your shell's config file.

If that doesn't resolve the issue, you can try making a small handler from the development server that just prints sys.path and share the output of that. It will also help to confirm if all external imports don't work and not just the Django import.

[Mak Ahmad]

Hi Adam,

How do I remove them from the PYTHONPATH? Here's what I get when I do 

emacs ~/.bash_profile

# The next line updates PATH for the Google Cloud SDK.                          

source '/Users/USERNAME/gcloudsdk/google-cloud-sdk/path.bash.inc'

# The next line enables shell command completion for gcloud.                    

source '/Users/USERNAME/gcloudsdk/google-cloud-sdk/completion.bash.inc'

export GAE="/Users/USERNAME/Documents/google_appengine"

export PYTHONPATH="$PYTHONPATH:$GAE:$GAE/lib/django-1.5"

export PATH=${PATH}:$GAE/lib/django-1.5/django/bin/

Is this where it needs to be changed I don't even know where the leading ':' syntax error came from 

[Yunkai Zhou]

Hi Mak,

Try modify

export PYTHONPATH="$PYTHONPATH:$GAE:$GAE/lib/django-1.5"

to

export PYTHONPATH="$GAE:$GAE/lib/django-1.5"

I suspect $PYTHONPATH is empty string before that export line, which creates a leading : after export.

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[Mak Ahmad]

I made that change in the bash file and re-ran the export and get this now

USERNAME-macbookpro:Documents USERNAME$ export |grep PYTHON

declare -x PYTHONPATH=":/Users/USERNAME/Documents/google_appengine:/Users/USERNAME/Documents/google_appengine/lib/django-1.5"

my bash profile is now

# The next line updates PATH for the Google Cloud SDK.                          

source '/Users/USERNAME/gcloudsdk/google-cloud-sdk/path.bash.inc'

# The next line enables shell command completion for gcloud.                    

source '/Users/USERNAME/gcloudsdk/google-cloud-sdk/completion.bash.inc'

export GAE="/Users/USERNAME/Documents/google_appengine"

export PYTHONPATH="$GAE:$GAE/lib/django-1.5"

#export PYTHONPATH="$PYTHONPATH:$GAE:$GAE/lib/django-1.5"                      

export PATH=${PATH}:$GAE/lib/django-1.5/django/bin/

running the server, I still get the import django error using command line

[Adam (Cloud Platform Support)]

As I mentioned, this variable should not even be needed, so try removing that line completely. If that doesn't work, something else is messing up your sys.path, so please try dumping sys.path from your app handler to see what's going on.

[Mak Ahmad]

ok I can run it now with command line

So the sys.path was pointing to gcloudsdk's django 1.5 folder which didn't even exist. So I copied it from my google app engine folder and it worked

cp -R /Users/USERNAME/Documents/google_appengine/lib/django-1.5 /Users/USERNAME/gcloudsdk/google-cloud-sdk/platform/google_appengine/lib

 thanks all

[Adam (Cloud Platform Support)]

Glad you found the issue. Since it looks like the GAE SDK isn't in your PATH at all, you're calling the development server from the Cloud SDK whenever you invoke 'dev_appserver.py' from the command line.

A solution to solve all import errors is to put the GAE SDK first in your path, as such:

export PATH={$GAE}:${PATH}

[Esteban Bonham]

I was having the same problem and realized I did not do the last optional step for installing google cloud SDK:

gcloud components install app-engine-python

from https://cloud.google.com/appengine/docs/standard/python/download

On Saturday, August 13, 2016 at 9:31:47 AM UTC-7, Mak Ahmad wrote: