错误:

Traceback (most recent call last):
  File "/home/ray/demo04_ws/devel/lib/tf02_dynamic/demo02_dynamic_sub_p.py", line 15, in <module>
    exec(compile(fh.read(), python_script, 'exec'), context)
  File "/home/ray/demo04_ws/src/tf02_dynamic/scripts/demo02_dynamic_sub_p.py", line 22, in <module>
    from geometry_msgs import tf2_geometry_msgs
ImportError: cannot import name 'tf2_geometry_msgs' from 'geometry_msgs' (/opt/ros/noetic/lib/python3/dist-packages/geometry_msgs/__init__.py)

错误原因:

所导的python功能包不对

本例子的错因:

解决方法:

把geometry_msgs改为tf2_geometry_msgs即可.