Docker container image must first contain OS (ubuntu, debian) or can I install the application right away?

Question

Django

Docker. I want to install django. Does the container first need to contain the OS image or can you install the application right away?

Answer 1

The container should at least contain the environment in which you are going to install the django.
At least so that you can run operating system commands in it.
If religion does not allow you to collect the desired container from the image with the OS, then you can look for ready-made ones with django already installed.

Answer 2

must contain the python of the desired version and janga.