Daniel Arbuckle's Mastering Python

Python interactive shell

Now that we've got a command-line window, we'll go straight into the Python interactive shell. We do that by typing python into the command-line window.

If you have multiple versions of Python installed and we want to interact with a specified version, we can explicitly choose the version from the command line by typing in that version's name. For example, if we type python3, we'll explicitly start up some version of Python 3.X:

The python3 command is used for Linux users. Windows users should type python command line to work.

Now, the fun really starts!

When we see the >>> prompt, we can type in any Python expression ...