No module named 'altair.vegalite.v4'

The error message "No module named 'altair.vegalite4'" indicates that the Altair library is not installed or not properly imported in your Python environment.

To resolve this issue, you can try installing the Altair library using the following command:

pip install altair

Make sure you have a stable internet connection, and if you are using a virtual environment, activate it before running the command. Once the installation is successful, you should be able to import the required module without any issues.

If you already have Altair installed, it's possible that there is a version mismatch. In that case, you can try upgrading Altair to the latest version using the command:

pip install --upgrade altair

After upgrading, try importing the module again and see if the error persists.