I have installed Django after activating my virtualenv but still I am getting following error
from django.core.management import execute_from_command_line Import
If you're using virtualenv, you can add it to your path using sys.path.append('./myvenv/lib/python3.5/site-packages').
sys.path.append('./myvenv/lib/python3.5/site-packages')
Try closing and opening the terminal again. That worked for me too.