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Can someone show me the correct "Hello World" on ROS?

As a very beginner on ROS, I am trying to produce the minimum code for printing "Hello World" on the screen. My Python version: 3.8, operating system: Ubuntu, ROS system: Noetic. This is the simple code I tried:

import rospy
if --name-- == "--main--":
   print("hello world")

after entering in the terminal:

 runros mypackagename helloWorld.py

error messages come up: import command not found, syntax error unexpected token '"hello world"'

Solution

  • Problem solved! First I had forgotten the header code in the first line, and then I forgot to add the 3 for the correct python version. So, the correct hallo world code is:

    #!/usr/bin/python3
if __name__ == '__main__':
    print('Hello World!')

    Thank you @BTables, for pointing out the syntax error of the double-quotes.