It seems the issue occurs because VSCode, Pylance, and the debugger are not using the Python interpreter inside your Docker container where streamlit is installed. When you run streamlit from the terminal, it works because it uses the correct environment within the container. To fix this, ensure that VSCode is configured to use the Python interpreter inside your container (e.g., /usr/local/bin/python3.10). Update your launch.json file to specify this interpreter explicitly in your debug configurations, and make sure Pylance is set to use the same interpreter by adjusting your settings.json if necessary. Avoid setting PYTHONHOME, as it can cause conflicts. By aligning VSCode, Pylance, and the debugger to use the correct interpreter inside your Docker container, they should be able to resolve the streamlit module, and the debugger should run without any exceptions.