How To Run Publisher and Subscriber Node In Robot Operating System(ROS) with python?

First install ROS in ubuntu OS by following given official web address:

http://wiki.ros.org/melodic/Installation/Ubuntu

And after this follow given steps to run python node:

First create catkin_ws by using following command:

$mkdir catkin_ws

$cd catkin_ws/

And then after create directory src inside catkin_ws:

$mkdir src

$ls

$cd src/

Back to the catkin_ws and run catkin_make

$cd ..

$catkin__make

And then create devel inside it

$source devel/setup.bash

$clear

$ls

$cd #(go to the main directory)

$clear

Check roscore is running or not if not then run by using "roscore" and open new another terminal

And follow all command step by step which is given bellow.

$cd catkin_ws/

$ls

$cd src

$ls

$catkin_create_pkg tutorial std_msgs rospy roscpp

$cd ..

$catkin_make

$clear

$ls

$cd src

$cd tutorial/

$ls

$cd src

$ls

$clear

$nano talker.py #(new block window open paste code in it)

$ctrl+o #(for save)

$enter

$ctrl+x (fro exit)

$sudo chmod +x talker.py # chmod used for read and write mode

$clear

$cd -/catkin_ws/ # or use cd .., cd .., cd .. and goto the catkin_ws directory

$catkin_make

$ls

$cd devel/

$ls

$source setup.bash

$cd .. #(back to catkin_ws directory)

$clear

$rosrun tutorial talker.py #(running on catkin_ws directory)

$cd src/tutorial/src/

$ls

$nano listener.py # paste code and save

$ctrl+o

$ctrl+x # for exit

$sudo chmod +x listener.py # cd .., cd .. until back to the catkin_ws and run

$catkin_make

$clear

$cd devel

$source setup.bash

$cd .. #(back to catkin directory)

$clear

$rosrun tutorial listener.py

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if you want to edit file then this query

$rosed tutorial talker.py

If you need any help related to ros then contact at here or comments in comments sections.

#ros #pythonros #pythonassignmentshelp