import jupyros is failing

Hi there!

Several names are unknown in the code. It started by Unicode in file jupyros/ros3d.py => I explicitly import it by a from traitlets import Unicode But then, I'm getting a:

>>> import jupyros
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/meunier/miniforge3/envs/ros_env2/lib/python3.9/site-packages/jupyros/__init__.py", line 16, in <module>
    from .ros3d import *
  File "/home/meunier/miniforge3/envs/ros_env2/lib/python3.9/site-packages/jupyros/ros3d.py", line 78, in <module>
    class TFClient(widgets.Widget):
  File "/home/meunier/miniforge3/envs/ros_env2/lib/python3.9/site-packages/jupyros/ros3d.py", line 95, in TFClient
    ros = Instance(ROSConnection).tag(**sync_widget)
NameError: name 'Instance' is not defined

I've done the standard installation of Robotstack, for ROS Noetic, followed by: mamba install jupyter-ros -c robostack On a x86_64 macchine running Ubuntu 20.04.6 LTS

Some version info:

jupyter-ros               0.5.0              pyhd8ed1ab_0    robostack
jupyter_client            7.4.9              pyhd8ed1ab_0    conda-forge
jupyter_core              5.5.0            py39hf3d152e_0    conda-forge
jupyter_events            0.9.0              pyhd8ed1ab_0    conda-forge
jupyter_server            2.10.1             pyhd8ed1ab_0    conda-forge
jupyter_server_fileid     0.9.0              pyhd8ed1ab_0    conda-forge
jupyter_server_terminals  0.4.4              pyhd8ed1ab_1    conda-forge
jupyter_server_ydoc       0.8.0              pyhd8ed1ab_0    conda-forge
jupyter_ydoc              0.2.4              pyhd8ed1ab_0    conda-forge
jupyterlab                3.6.6              pyhd8ed1ab_0    conda-forge
jupyterlab_pygments       0.2.2              pyhd8ed1ab_0    conda-forge
jupyterlab_server         2.25.1             pyhd8ed1ab_0    conda-forge
jupyterlab_widgets        3.0.9              pyhd8ed1ab_0    conda-forge

Thanks for any help, JL

RoboStack / jupyter-ros

import jupyros is failing #155