python manage.py migrate 오류

django를 제대로 설치한 후 영상과 똑같이 따라하였는데 오류가 발생합니다. 파이썬과 django의 버전이 맞지 않아서 오류가 나는 것일까요?

Traceback (most recent call last):
  File "manage.py", line 10, in main
    from django.core.management import execute_from_command_line
ModuleNotFoundError: No module named 'django'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 16, in main
    ) from exc
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?