title: Importing a class and calling a method
body: <p>I am using Eclipse for Python programming.</p>
  
  <p>In my project, I have a file: main.py. This file is located in the root of the project files hierarchy. In the root itself, I created a folder with the name Classes in which I have a class file named: PositionWindow.py. This file contains a class PositionWindow and the class itself contains a function named: Center().</p>
  
  <p>In main.py, I want to import this class [PositionWindow] and later call that function Center in the appropriate place.</p>
  
  <p>I am not able to import that class correctly in main.py and not following how to call that function later.</p>