Only with ros2 run: ModuleNotFoundError: No module named 'nuscenes.nuscenes'

[juliaivonne]

I am using ROS2 Foxy on Ubunu 20.04 with Python 3.8. I need to use nuscenes inside a ROS2-Node but I always get a ModuleNotFoundError.
I tried the following things:

1. installing via pip install inside a venv (Creating via python venv module). Inside the python shell and PyCharm, everything works fine. (import nuscenes works). But when I am trying to run my "testing node" (see below), I get the error. (Yes, my venv was activated the whole time and I put "[build_scripts]
   executable=/usr/bin/env python3" to my setup.cfg of the node. Also, another module only installed inside my venv worked without errors. So I think, the venv is not the problem)

2. installing via the advanced installation inside my venv (following https://github.com/nutonomy/nuscenes-devkit/blob/master/docs/installation.md#install-required-packages). Same Problem as 1

3. I read, that nuscenes was only tested with python 3.7 and python 3.6, so I creating a conda env with python 3.7 for nuscenes. I tried installing via the advanced installation, but I got an error about the requirement for numpy. Since Python 3.7 only works for numpy until 1.21 and the requirements-file requires numpy>=1.22.0, I had to change the requirements to numpy>=1.19.5. Then I was able to install nuscenes, but I got errors about ros2 (pkg_resources.DistributionNotFound: The 'ros2cli==0.9.13' distribution was not found and is required by the application).

I don't know what else to do. I also checked the pythonpathes. Is there any way to use nuscenes for ROS2 Foxy and Python 3.8?

I used the following "testing node":
from nuscenes.nuscenes import NuScenes
import pydash

def main():
print('Hi from nuscenes.')
print(pydash.file)
if name == 'main':
main()

both modules, nuscenes and pydash are only installed inside the two venvs.

[whyekit-motional]

@juliaivonne perhaps you can reach out to the ROS community regarding this