Hello Isabel,
The steps needed to add python packages in your custom Linux image with Yocto:
in the mdm9x15-image.inc file (If your taget is wp85), add python “core” package
IMAGE_INSTALL += " python"
To add more python packages (optionals, depending on your needs):
IMAGE_INSTALL += " python-threading
python-math
python-io
python-pickle
etc…"
Idem with nodejs.
IMAGE_INSTALL += " nodejs"
Best regards,
Sylvain