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How to define a python version for ROS

asked 2019-11-29 07:24:21 -0500

goszjacek gravatar image

I try to run the teleop node using cmd:

rosrun turtlebot3_teleop turtlebot3_teleop_key

But I get an error

  File "/home/goszjacek/catkin_ws/src/turtlebot3/turtlebot3_teleop/nodes/turtlebot3_teleop_key", line 140
    print msg
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(msg)?

Python path is set to:


But anyway ROS tries to run the turtlebot3_teleop_key with python3. How can I force ROS to use 2.7, or can I change it in the settings?

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Always add your ROS Distro to your question to get more directed answer. Because ROS Kinetic supports only python 2.7 but there are ways to compile it with different version.

Gokul gravatar image Gokul  ( 2019-11-30 16:29:21 -0500 )edit

If you run python --version which version is it using? Also check the shebang line at the beginning of the script (the line with #!/usr/bin/env python)

ejalaa12 gravatar image ejalaa12  ( 2021-02-25 15:42:20 -0500 )edit

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answered 2019-11-30 16:33:07 -0500

Gokul gravatar image

You can use this command

catkin build --cmake-args -DPYTHON_VERSION=2.7

For further reference, you can try out different solution posted here for this question

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Asked: 2019-11-29 07:24:21 -0500

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Last updated: Nov 30 '19