How to kill python process ran by shell script when shell script dies?

I have a shell script that runs python. **start.sh**

# Setup environment
cd ~/foobar/ && \
    python3 -m venv env && \
    source env/bin/activate && \
    pip install -q -r requirements.txt && \
    find . -maxdepth 1 -type f -name "*.py" | xargs pylint

# Run scripts
python ~/foobar/main.py

If I ctrl+c in the terminal, it will shutdown the python properly. However if I pkill -9 start.sh, it will prompt Killed but the python is still running. Is there a way to kill the python script when the calling script dies?