ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH en

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?

1. 可能未进入虚拟环境 （workon ****）
2. 虚拟环境未激活 （source activate）