ImportError: cannot import name 'Log' from 'rosgraph_msgs.msg'

[zkailinzhang]

import bagpy

ImportError Traceback (most recent call last)
in
----> 1 import bagpy

---> 49 from .client import spin, myargv, init_node,
50 get_published_topics,
51 wait_for_message, \

~//lib/python3.7/site-packages/rospy/client.py in
52 import roslib
53
---> 54 import rospy.core
55 from rospy.core import logwarn, loginfo, logerr, logdebug
56 import rospy.exceptions

~//lib/python3.7/site-packages/rospy/core.py in
73 from rospy.impl.validators import ParameterInvalid
74
---> 75 from rosgraph_msgs.msg import Log
76 from functools import partial
77

ImportError: cannot import name 'Log' from 'rosgraph_msgs.msg' (/opt/ros/dashing/lib/python3.6/site-packages/rosgraph_msgs/msg/init.py)

[rahulbhadani]

Please provide more details on what version of Ubuntu you have, and what version of ROS you are using. ROS 2 and beyond Ubuntu 20.04 is not supported. You seem to have ROS dashing which is ROS 2. bagpy is meant for ROS 1.