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Hi,
You need to check your $PYTHONPATH running echo $PYTHONPATH
This should show the path to your ROS distro, e.g. opt/ros/eloquent/lib/python3.6/site-packages, and the path to your environment packages .../path-to-your-env/lib/python3.6/site-packages.
If the env-package path is not present, add it using export PYTHONPATH='.../path-to-your-env/lib/python3.6/site-packages'
Run echo $PYTHONPATH again, check that your env-package path is there, and try to run your node ros2 run node...,... this should work.
To avoid adding the env-package path to $PYTHONPATH every single time, add export PYTHONPATH='.../path-to-your-env/lib/python3.6/site-packages' to your environment activate file.
Good luck!
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