In the next few sections, I will use a tool called the Python shell, which will help you get more comfortable using Python. The Python shell is a tool that allows the user to enter in Python commands, which get run instantaneously. This makes the Python shell a great place to quickly and easily experiment with small bits of code or new functionality in Python.
You can run the Python shell from a Terminal. To do this, open a Terminal and, from any directory, enter one of the following depending on your configuration:
$ Python
$ python3
You should see a new command prompt within the Terminal that looks something like this:

In Python, a single instruction is called a simple statement. For now, each individual...