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I usually program in C++ when working with ROS. By the way, what you first define as publisher.py is not a python file, it is a message file and it must be a *.msg file. Once you've written the code of your *.msg file, you must compile it in order to let ROS create the header file for that message.

To use that message, lets imagine you've called your message my_msg, so you must write in python something like this:

import rospy
from your_ros_package_name import my_msg

def publisher():
  pub = rospy.Publisher('topicName',my_msg, queue_size=10)

Try with something like this. It could be some python spelling mistake because as I've already told you I am used to work with C++ nodes.