Handling command-line arguments with argparse

In this section, we'll see how to make the program read data from its command line, a common feature for programs of all sorts. Most command-line programs and a surprising number of graphical user interface programs as well can be given extra information on the command line, after the command that invokes the program. These extra bits of information are referred to as arguments and they are delivered to Python programs as a list of strings. It turns out that there's quite a lot of code involved in turning an argument list into useful information, especially, if we want to make the program as convenient for our users as possible. Fortunately, a lot of that code can be the same from program to program, and the Python standard library's argparse module takes care of much of the effort for us.

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