Chapter 1 - An Intro to Argument
Parsing using argparse
Have you ever wondered how to process command line arguments in Python? Yeah, there’s a module
for that. It’s called argparse, which is a replacement for optparse. In this article, we’ll be taking a
whirlwind tour of this helpful module. Let’s start with something simple!
Getting Started
I have always found the simplest way to explain a coding concept is to show some code. So that’s
what we’re going to do. Here’s a super simple example that doesn’t do much of anything:
1 >>> import argparse
2 >>> parser = argparse.ArgumentParser(
3 ... description="A simple argument parser",
4 ... epilog="This is where you might put example usage"
5 ... )
6 ...
7 >>> parser.print_help()
8 usage: _sandbox.py [-h]
9
10 A simple argument parser
11
12 optional arguments:
13 -h, --help show this help message and exit
14
15 This is where you might put example usage
Here we just import argparse and give it a description and set up a usage section. The idea here is
that when you ask the program you are creating for help, it will tell you how to use it. In this case, it
prints out a simple description, the default optional arguments (“-h” in this case) and example usage.
Now let’s make this example a bit more concrete. You won’t normally be parsing arguments from
the command-line after all. So we’ll move the code into a Python function inside of a Python file:
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