trying to run a python script for robot

asked 2020-11-03 16:44:12 -0500

PGTKing
13 ●16 ●28 ●38

updated 2021-01-13 22:47:26 -0500

jayess
6155 ●26 ●85 ●92

Hi ros community, I am trying to run a python script but I am getting this error: ImportError: No module named yaml After running rosrun rrbot_control main.py in the terminal, I receive this.

Traceback (most recent call last):

  File "/home/brendan/catkin_ws/src/gazebo_ros_demos/rrbot_control/scripts/main.py", line 3, in <module>
    import rospy

  File "/opt/ros/noetic/lib/python3/dist-packages/rospy/__init__.py", line 47, in <module>
    from std_msgs.msg import Header

  File "/opt/ros/noetic/lib/python3/dist-packages/std_msgs/msg/__init__.py", line 1, in <module>
    from ._Bool import *

  File "/opt/ros/noetic/lib/python3/dist-packages/std_msgs/msg/_Bool.py", line 6, in <module>
    import genpy

  File "/opt/ros/noetic/lib/python3/dist-packages/genpy/__init__.py", line 34, in <module>
    from . message import Message, SerializationError, DeserializationError, MessageException, struct_I

  File "/opt/ros/noetic/lib/python3/dist-packages/genpy/message.py", line 48, in <module>
    import yaml

ImportError: No module named yaml

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answered 2020-11-03 16:50:41 -0500

skpro19

310 ●35 ●65 ●58 https://twitter.com/skpro19

Find the location of pip in your system by running the command 'which pip'.

Then, using your terminal, navigate to that location, and run 'pip install PyYAML'.

Hopefully, this should resolve the issue.

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pip doesn't exist only pip3. When running pip3 instal PyYAML i get Requirement already satisfied: PyYAML in /usr/lib/python3/dist-packages (5.3.1)

PGTKing ( 2020-11-03 17:23:05 -0500 )edit

Can you share the Python script that you are trying to run?

skpro19 ( 2020-11-04 07:46:57 -0500 )edit

@skpro19

#!/usr/bin/env python
# license removed for brevity

import rospy
from std_msgs.msg import Float64
import math

def talker():
    pub = rospy.Publisher('/rrbot/joint1_position_controller/command', Float64, queue_size=10)
    rospy.init_node('talker', anonymous=True)
    rate = rospy.Rate(10) # 10hz

    while not rospy.is_shutdown():
        #hello_str = "hello world %s" % rospy.get_time()

        position = 0.0
        rospy.loginfo(position)
        pub.publish(position)
        rate.sleep()


if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException:
        pass

PGTKing ( 2020-11-04 11:20:57 -0500 )edit

SOLVED!!!!!!!!!! changed python to python3 now works

PGTKing ( 2020-11-04 14:52:39 -0500 )edit

Haha. Okay. I thought you had already set the keyword 'python' to point to 'python3' in your system.

skpro19 ( 2020-11-04 15:14:59 -0500 )edit

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answered 2020-11-03 16:47:39 -0500