Another thing that we can do is view the top element of the stack so we can ask the data structure: “What’s the top element?” and it can give that to us using the peek operation. Note that the peek operation does not remove the top element, it merely returns it.

We can also check whether or not the stack is empty, and a few other things too, that will come along the way as we implement it.

Now I’m going to create a stack class, and the constructor of the class is going to initialize a Python list. The Python list has a lot of things that we’re after, and it’s going to make it easier for us to tweak Python’s implementation of the list to be adapted to what we would expect to see in a stack, namely, push/pop.