How to rerun docker-compose after modifying containerized python script

Docker newbie question here.

I am working on containerizing my own Python script, following this tutorial and that tutorial.

I noticed that when I fix an error in my Python script (myscript.py), this change is not seen upon rerunning sudo docker-compose up. I need to change the app name in docker-compose.yml (e.g. from my-awesome-app2 to my-awesome-app3) to get it to run.

I tried listing the available containers using sudo docker container ls -a and then removing the unused containers with sudo docker rm <CONTAINER ID> but this did not help.

How can I get docker-compose to see the changes made to the Python script, without having to keep changing the Dockerfile?

---

Here is my docker-compose.yml:

version: "3"
services:
  my-awesome-app3:
    build:
      context: .

Here is my Dockerfile:

FROM python:3.8.3
# Or any preferred Python version.
ADD myscript.py .
RUN pip3 install pywavelets scipy 
CMD ["python", "./myscript.py"] 
# Or enter the name of your unique directory and parameter set.

And here is myscript.py:

from scipy.misc import electrocardiogram

import pywt
import numpy as np
ecg = electrocardiogram()
FPData = ecg.reshape(10800,-1)
DWTcoeffs = pywt.wavedec(FPData[:,1], 'db4')
filtered_data_dwt=pywt.waverec(DWTcoeffs,'db4',mode='symmetric',axis=-1)
print(filtered_data_dwt)

Let’s say that I make a typo (print(filtered_data) instead of print(filtered_data_dwt))… Rerunning sudo docker-compose up will still trigger:

my-awesome-app2_1 | NameError: name ‘filtered_data’ is not defined