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This error: TypeError: 'instancemethod' object has no attribute '__getitem__' means that you're trying to use square brackets ( __getitem__ ) on something that doesn't support them; namely a method.

For the publish method call, you should be using parentheses, just like any other method call in python. You'll also need to revise the argument to your publish call; it should be a python message object:

msg = Twist() # create a new Twist message object
msg.linear.y = 1 # set the linear y component to 1
pub.publish(msg) # publish your message