Incompatibility of humble with python3.6: signals.valid_signals() #879
Description
Bug report
#639 introduced an incompatibility with python 3.6, which is the minimum requirement for humble and default on rhel 8.
I'm not proficient enough with python, maybe there is a workaround for this to make it compatible with python 3.6
Required Info:
- Operating System:
- RHEL8
- Installation type:
- binaries
- Version or commit hash:
- 0.18.7
Steps to reproduce issue
Run tests for ros2_control
Expected behavior
no error
Actual behavior
8: Traceback (most recent call last):
8: File "/opt/ros/humble/bin/ros2", line 11, in <module>
8: load_entry_point('ros2cli==0.18.7', 'console_scripts', 'ros2')()
8: File "/opt/ros/humble/lib/python3.6/site-packages/ros2cli/cli.py", line 89, in main
8: rc = extension.main(parser=parser, args=args)
8: File "/opt/ros/humble/lib/python3.6/site-packages/ros2run/command/run.py", line 70, in main
8: return run_executable(path=path, argv=args.argv, prefix=prefix)
8: File "/opt/ros/humble/lib/python3.6/site-packages/ros2run/api/__init__.py", line 73, in run_executable
8: if -process.returncode in signal.valid_signals() and os.name == 'posix':
8: AttributeError: module 'signal' has no attribute 'valid_signals'
Additional information
valid_signals() was introduced with python 3.8: https://docs.python.org/3/library/signal.html#signal.valid_signals
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