Izuzvo Izuzvo - 1 year ago 66
Python Question

Why does django 1.9 keeps using python2.7 when my virtualenv have python3.5?

Im having problems with python versions, im actually developing a web page with python3.5 under Windows 7. But in my server (CentOS 7) i created a virtualenv with python3.5 (because the default version of python in linux is 2.7).

The problem is that when i get an error, it says that django is using python2.7:

Request Method: GET
Request URL: http://proyect/url/
Django Version: 1.9.8
Exception Type: UnicodeEncodeError
Exception Value:
'ascii' codec can't encode character u'\xed' in position 9: ordinal not in range(128)
Exception Location: /usr/lib/python2.7/site-packages/django/utils/encoding.py in force_text, line 80
Python Executable: /usr/bin/python
Python Version: 2.7.5
Python Path:
['/home/user/proyect',
'/home/user/proyect_env/lib/python3.5/site-packages',
'/usr/lib64/python27.zip',
'/usr/lib64/python2.7',
'/usr/lib64/python2.7/plat-linux2',
'/usr/lib64/python2.7/lib-tk',
'/usr/lib64/python2.7/lib-old',
'/usr/lib64/python2.7/lib-dynload',
'/usr/lib64/python2.7/site-packages',
'/usr/lib64/python2.7/site-packages/gtk-2.0',
'/usr/lib/python2.7/site-packages']


I'm almost 100% sure that this message is displayed because django is using a wrong python version.

In my django.conf inside /etc/httpd/conf.d/ i have this configured:

WSGIDaemonProcess proyect python-path=/home/user/proyect:/home/user/proyect_env/lib/python3.5/site-packages
WSGIProcessGroup project
WSGIScriptAlias / /home/user/proyect/proyect/wsgi.py


I followed this tutorial to configure my server.

Edit #1
After following @Ixer indications, i got this error traceback in /etc/httpd/logs/error_log

7:49:05.114720 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] mod_wsgi (pid=14836): Exception occurred processing WSGI script '/home/user/proyect/proyect/wsgi.py'.
[Tue Sep 20 17:49:05.114779 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] Traceback (most recent call last):
[Tue Sep 20 17:49:05.114810 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 158, in __call__
[Tue Sep 20 17:49:05.114862 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] self.load_middleware()
[Tue Sep 20 17:49:05.114883 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 51, in load_middleware
[Tue Sep 20 17:49:05.114910 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] mw_class = import_string(middleware_path)
[Tue Sep 20 17:49:05.114926 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/utils/module_loading.py", line 20, in import_string
[Tue Sep 20 17:49:05.114951 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] module = import_module(module_path)
[Tue Sep 20 17:49:05.114966 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
[Tue Sep 20 17:49:05.114991 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] __import__(name)
[Tue Sep 20 17:49:05.115007 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/contrib/auth/middleware.py", line 3, in <module>
[Tue Sep 20 17:49:05.115031 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] from django.contrib.auth.backends import RemoteUserBackend
[Tue Sep 20 17:49:05.115046 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/contrib/auth/backends.py", line 4, in <module>
[Tue Sep 20 17:49:05.115070 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] from django.contrib.auth.models import Permission
[Tue Sep 20 17:49:05.115085 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/contrib/auth/models.py", line 4, in <module>
[Tue Sep 20 17:49:05.115109 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
[Tue Sep 20 17:49:05.115124 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/contrib/auth/base_user.py", line 49, in <module>
[Tue Sep 20 17:49:05.115148 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] class AbstractBaseUser(models.Model):
[Tue Sep 20 17:49:05.115163 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/db/models/base.py", line 94, in __new__
[Tue Sep 20 17:49:05.115187 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] app_config = apps.get_containing_app_config(module)
[Tue Sep 20 17:49:05.115203 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 239, in get_containing_app_config
[Tue Sep 20 17:49:05.115226 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] self.check_apps_ready()
[Tue Sep 20 17:49:05.115241 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 124, in check_apps_ready
[Tue Sep 20 17:49:05.115263 2016] [:error] [pid 14836] [remote 10.105.40.106:49676] raise AppRegistryNotReady("Apps aren't loaded yet.")


Edit #2

The problem was solved, the situation was that when i was installing apps via pip install -r requirements.txt, for some reason they were installed under python 2.7 (even when i sourced the virtualenv activate). So what i did was to install again the apps via /home/user/project_env/bin/pip install -r requirements... this fixed the error but now im having problems with an app:

[Tue Sep 20 21:34:49.998172 2016] [:error] [pid 18220] [remote 10.105.40.106:172] mod_wsgi (pid=18220): Target WSGI script '/home/user/project/project/wsgi.py' cannot be loaded as Python module.
[Tue Sep 20 21:34:49.998207 2016] [:error] [pid 18220] [remote 10.105.40.106:172] mod_wsgi (pid=18220): Exception occurred processing WSGI script '/home/rortega/smce/smce/wsgi.py'.
[Tue Sep 20 21:34:49.998229 2016] [:error] [pid 18220] [remote 10.105.40.106:172] Traceback (most recent call last):
[Tue Sep 20 21:34:49.998255 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project/project/wsgi.py", line 33, in <module>
[Tue Sep 20 21:34:49.998314 2016] [:error] [pid 18220] [remote 10.105.40.106:172] application = get_wsgi_application()
[Tue Sep 20 21:34:49.998326 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
[Tue Sep 20 21:34:49.998362 2016] [:error] [pid 18220] [remote 10.105.40.106:172] django.setup()
[Tue Sep 20 21:34:49.998372 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/django/__init__.py", line 18, in setup
[Tue Sep 20 21:34:49.998406 2016] [:error] [pid 18220] [remote 10.105.40.106:172] apps.populate(settings.INSTALLED_APPS)
[Tue Sep 20 21:34:49.998417 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/django/apps/registry.py", line 85, in populate
[Tue Sep 20 21:34:49.998516 2016] [:error] [pid 18220] [remote 10.105.40.106:172] app_config = AppConfig.create(entry)
[Tue Sep 20 21:34:49.998527 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/django/apps/config.py", line 90, in create
[Tue Sep 20 21:34:49.998590 2016] [:error] [pid 18220] [remote 10.105.40.106:172] module = import_module(entry)
[Tue Sep 20 21:34:49.998601 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
[Tue Sep 20 21:34:49.998637 2016] [:error] [pid 18220] [remote 10.105.40.106:172] __import__(name)
[Tue Sep 20 21:34:49.998647 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/stdimage/__init__.py", line 5, in <module>
[Tue Sep 20 21:34:49.998676 2016] [:error] [pid 18220] [remote 10.105.40.106:172] from .models import StdImageField # NOQA
[Tue Sep 20 21:34:49.998686 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/stdimage/models.py", line 14, in <module>
[Tue Sep 20 21:34:49.998751 2016] [:error] [pid 18220] [remote 10.105.40.106:172] from PIL import Image, ImageOps
[Tue Sep 20 21:34:49.998761 2016] [:error] [pid 18220] [remote 10.105.40.106:172] File "/home/user/project_env/lib/python3.5/site-packages/PIL/Image.py", line 67, in <module>
[Tue Sep 20 21:34:49.999163 2016] [:error] [pid 18220] [remote 10.105.40.106:172] from PIL import _imaging as core
[Tue Sep 20 21:34:49.999185 2016] [:error] [pid 18220] [remote 10.105.40.106:172] ImportError: cannot import name _imaging

Answer Source

That manual doesn't seem right, since it doesnt tell how to use the virtualenv on the server. Even though the last line of the apache config points to a wsgi config, it does not explain what should be in there.

try something like this:

#/home/user/project/project/wsgi.py

import os
import sys
import site

# Add the site-packages of the chosen virtualenv to work with
site.addsitedir('~/.virtualenvs/myprojectenv/local/lib/python3.5/site-packages')

# Add the app's directory to the PYTHONPATH
sys.path.append('/home/django_projects/MyProject')
sys.path.append('/home/django_projects/MyProject/myproject')

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

# Activate your virtual env
activate_env=os.path.expanduser("~/.virtualenvs/myprojectenv/bin/activate_this.py")
execfile(activate_env, dict(__file__=activate_env))

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