Review on PSAD 3.5

While I was studying Problem Solving Algorithms and Data Structures using Python, I found that some of you might need more explanation on how to run the code in listings.

How to use pythonds?

pythonds is a package that has the basic data structures written in Python. You can down load it where the book is pointing:

http://www.pythonworks.org/pythonds

After downloading it, you need to install it to use it as described in the book. What I did was to click terminal tab in PyCharm and move to 'Downloads' folder on my iMac. And I ran 'pip3 install pythonds'. (I'm using Python3.6.0).

Please have a look this page:

http://stackoverflow.com/questions/39859834/how-can-i-install-pythonds-module

By the way, it is very interesting to push integer, string, floating point values in one stack.