How to dynamically update a python script inside a docker container?

Question

Python

There is a task to do something like a sandbox inside the docker container, fill in the script there and start waiting for execution. Interaction with the sandbox upload/run/delete is possible through ui (flask, for example, as a main script with a forwarded port from docker), upload the necessary script for the test, run it in a child process and you're done, but what if, for example, you need to run a flask application in a child process, it also (port) must be thrown out of the docker.
Or maybe there are alternative solutions so that you can throw a script into docker from outside and run it for execution, while waiting for the result of the execution?