... subscribing.

... publishing.

... subtitling.

... to multiple topics.

... only to a single topic.

... only to a special topic.

... subscribing.

... publishing.

... transfering.

for  [i in range(10)]:

  # do something

for i in range(10):

  # do something

Brackets.

Indentation.

Comments.

... a visualization library for Python, used to create plots.

... a library supports interfacing motor controllers to Python.

... a Python library to interfacing Matlab to ROS.