17.1 CS 172 - Lab Stack Math In this lab, we will experiment with the Stack data structure and see how some problems lend themselves well to this data structure. The Stack As mentioned in class, Python 3 provides the LifoQueue class as part of the Queue library. To see how this is really just a wrapper around the basic list class below is our own Stack class that uses a list. This code has been provided to you below in a module called stackclass. py You MAY NOT change the structure of the provided Stack class in ANY way. Your post-fix logic should go in your main script. If you find yourself wanting to add more methods to the class, it means you are writing redundant code and should stop. The Stack class has the following public interface: __init__()