Seems to be incompatible with python3.10

[sam-dirac]

When I try to use your package from the ros docker image for humble, I get errors such as this from urdf_parser_py running with python.310:

"/integration_tests/ros/assembly_view/assembly_view/state_publisher.py", line 67, in <module>
    main()
  File "/integration_tests/ros/assembly_view/assembly_view/state_publisher.py", line 62, in main
    print(urdf)
  File "/usr/local/lib/python3.10/dist-packages/urdf_parser_py/xml_reflection/basics.py", line 91, in __str__
    return yaml.dump(self.to_yaml()).rstrip()
  File "/usr/local/lib/python3.10/dist-packages/urdf_parser_py/xml_reflection/basics.py", line 87, in to_yaml
    return to_yaml(raw)
  File "/usr/local/lib/python3.10/dist-packages/urdf_parser_py/xml_reflection/basics.py", line 68, in to_yaml
    out[str(var)] = to_yaml(value)
  File "/usr/local/lib/python3.10/dist-packages/urdf_parser_py/xml_reflection/basics.py", line 72, in to_yaml
    elif isinstance(obj, collections.Iterable):
AttributeError: module 'collections' has no attribute 'Iterable'

The suggestion I've been given is to downgrade, but would it be possible to support python3.10? Or am I missing something else here?

The error message AttributeError: module 'collections' has no attribute 'Iterable' is due to a change in Python 3.10. The Iterable class has been moved from collections to collections.abc.

The error is coming from the urdf_parser_py package, which seems to be using the old import path. This package needs to be updated to work with Python 3.10.

As a workaround, you can use an older version of Python (3.9 or earlier) where collections.Iterable is still valid.

Can you please verify that your package works in python3.10?

[clalancette]

Can you please verify that your package works in python3.10?

As far as I know, it works fine with Python 3.10 and later. Looking at the current code, we correctly reference collections.abc.Iterable

However, I notice that the path to urdf_parser_py seems to be wrong. It shouldn't be in /usr/local/lib; it should be in /opt/ros/humble. Did you somehow install urdf_parser_py from pip?

[clalancette]

I'm going to assume the last comment is what is going on, and go ahead and close this one out.