newbie77's profile - activity

Will do, thank you. Good to know on ROS-1 and 20.10

Thank you, I missed those. My interpretation is that the packages will not work as my OS is 32 bit. If this is correct

"Unable to locate package" error on Raspberry Pi for every package I try to install I am attempting to add packages to

In case anyone else runs into this issue, my raspberry pi was running python2 and rospy needs python3, at least for Noet

I am new to ROS and am probably making an obvious mistake. I am running Noetic on Raspberry Pi 4 and it appears to have installed correctly. Specifically, I am trying to build a very simple node (based on an UDemy class) and keep getting rospy issues (or at least I think rospy issues).

Here is an outline of what I have done. I have tried many permutations and continue to get the same error. 1. catkin_make (run in catkin WS folder)

1. catkin_create_pkg (run in SRC folder)

2. Added scripts folder to the package folder

3. Ran catkin_make (tired this step and left out but error is the same)
4. Ran ". ~/ros_catkin_ws/devel/setup.bash" wile in catkin_ws folder because this seemed necessary based on what I read
5. Used touch command to create python file
6. Used chmod +x to make file executable
7. Wrote python script that I copied from Udemy class (prints "Hello")
8. Get the following error:

Traceback (most recent call last):
  File "my_first_node.py", line 3, in <module>
    import rospy
  File "/home/pi/ros_catkin_ws/devel/lib/python3/dist-packages/rospy/__init__.py", line 34, in <module>
    exec(__fh.read())
  File "<string>", line 49, in <module>
  File "/home/pi/ros_catkin_ws/src/ros_comm/rospy/src/rospy/client.py", line 60, in <module>
    import rospy.impl.init
  File "/home/pi/ros_catkin_ws/src/ros_comm/rospy/src/rospy/impl/init.py", line 54, in <module>
    from .tcpros import init_tcpros
  File "/home/pi/ros_catkin_ws/src/ros_comm/rospy/src/rospy/impl/tcpros.py", line 45, in <module>
    import rospy.impl.tcpros_service
  File "/home/pi/ros_catkin_ws/src/ros_comm/rospy/src/rospy/impl/tcpros_service.py", line 54, in <module>
    from rospy.impl.tcpros_base import TCPROSTransport, TCPROSTransportProtocol, \
  File "/home/pi/ros_catkin_ws/src/ros_comm/rospy/src/rospy/impl/tcpros_base.py", line 160
    (e_errno, msg, *_) = e.args
                   ^
SyntaxError: invalid syntax

Below is my python script for the node:

#!/usr/bin/env python3

import rospy

if __name__ == '__main__':
    rospy.init_node('my_first_python_node')
    rospy.loginfo("This node has been started")
rate = rospy.Rate(10)

while not rospy.is_shutdown():
    rospy.loginfo("Hello")
    rate.sleep()

You are correct, I meant Python 3. Thank you for catching my typo.

In case anyone else runs into this issue, my raspberry pi was running python2 and rospy needs python2, at least for Noet

Thank you! I was running Python 2. Also, I wan't sourcing the setup.bash every time I turned the Pi on.

rospy issues (noetic) I am new to ROS and am probably making an obvious mistake. I am running Noetic on Raspberry Pi 4