Pragmatic Ai – Robust Python CLI-iLLiTERATE
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Category: Tutorial
Build a robust Python CLI tool with argparse
The argparse module is part of the Python standard library and meant to help you build robust command line tools. Once you need flags, switches, values, or positional arguments, it is very difficult to achieve that without using a framework.
In this case, argparse can help build all you need to handle inputs in the terminal. We’ll see how a single file named size.py that calculates file sizes can make use of argparse to handle the input in the terminal. Then, we will cover how error handling is done automatically when the expectations from argparse aren’t met. And finally, we’ll go through some of the help menu options that construct the body of the help output.
Check the resources section for the GitHub repo with sample code
Since argparse is part of the Python standard library, there is no need for you to define or install any external dependencies. You are ensuring that any Python installation in any system will work correctly out of the gate. A very basic Python CLI tool without dependencies using the argparse module
Now that you know how to enhance a Python script into a more powerful one with argparse, you can try out other frameworks like the Click framework or something much simpler by using the sys module. I have examples and guides for the sys.argv module and for using the Click framework.
GitHub repo with sample code
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