couldn't import django in virtualenv but works when deactivated
1- install python3
 brew install python3
2- install django 
  pip3 install django
I am trying to deploy my Django Projects on Amazon AWS using Ubuntu 16.04. I am running python version 2.7.12 and Django 1.10.5. I created my virtualenv named venv and then activated it.
I get this error when I try to run python manage.py runserver.

Traceback (most recent call last):
    File "manage.py", line 17, in 
      "Couldn't import Django. Are you sure it's installed and "
  ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?

Then I realize Django might not be in my python path. So I added 

export PYTHONPATH="/usr/local/lib/python2.7/dist-packages/django"

into my venv/bin/activate script. Now with the virtualenv activated I can go into python and type

import sys
  sys.path
  ['', '/usr/local/lib/python2.7/dist-packages/django', '/home/ubuntu/TravelBuddy/venv/lib/python2.7', '/home/ubuntu/TravelBuddy/venv/lib/python2.7/plat-x86_64-linux-gnu', '/home/ubuntu/TravelBuddy/venv/lib/python2.7/lib-tk', '/home/ubuntu/TravelBuddy/venv/lib/python2.7/lib-old', '/home/ubuntu/TravelBuddy/venv/lib/python2.7/lib-dynload', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/home/ubuntu/TravelBuddy/venv/local/lib/python2.7/site-packages', '/home/ubuntu/TravelBuddy/venv/lib/python2.7/site-packages']

As you can see now django is indeed in my python path. I thought this was going to fix the problem but it didn't: it still says couldn't import Django. Now I am confused because when I deactivate my virtualenv and import Django it does work.
this is what prints out when I deactivate my virtualenv and do sys.path

['', '/usr/local/lib/python2.7/dist-packages/django', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages']