Python has a vast ecosystem of packages, modules, and libraries that you can use to create your application. Some of these packages and modules are included with your Python installation and are collectively known as the standard library.
The standard library consists of modules that provide standardized solutions to common programming problems. They’re great building blocks for applications across many disciplines. However, many developers prefer to use alternative packages, or extensions, that may improve on the usability and usefulness of what’s in the standard library.
In this tutorial, you’ll meet some of the authors at Real Python and learn about packages they like to use in place of more common packages in the standard library.
The packages you’ll learn about in this tutorial are:
pudb: An advanced, text-based visual debuggerrequests: A beautiful API for making HTTP requestsparse: An intuitive, readable text matcherdateutil: An extension for the populardatetimelibrarytyper: An intuitive command-line interface parser
You’ll begin by looking at a visual and powerful alternative to pdb.
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pudb for Visual Debugging
Christopher Trudeau is an author and course creator at Real Python. At work he’s a consultant who helps organizations improve their technical teams. At home, he spends his time with board games and photography.
I spend a lot of time working SSHed into remote machines, so I can’t take advantage of most IDEs. My debugger of choice is pudb, which has a text-based user interface. I find its interface intuitive and easy to use.
Python ships with pdb, which was inspired by gdb, which itself was inspired by dbx. While pdb does the job, the strongest thing it has going for it is that it ships with Python. Because it’s based on the command line, you have to remember a lot of shortcut keys and can only see small amounts of the source code at a time.
An alternative Python package for debugging is pudb. It displays a full screen of source code along with useful debugging information. It has the added benefit of making me feel nostalgic for the old days when I coded in Turbo Pascal:
The interface is divided into two main parts. The left panel is for source code, and the right panel is for context information. The right-hand side is subdivided into three sections:
- Variables
- Stack
- Breakpoints
Everything you need in a debugger is available on one screen.
Interacting With pudb
You can install pudb through pip:
$ python -m pip install pudb
If you’re using Python 3.7 or above, then you can take advantage of breakpoint() by setting the PYTHONBREAKPOINT environment variable to pudb.set_trace. If you’re using a Unix-based operating system such as Linux or macOS, then you set the variable as follows:
$ export PYTHONBREAKPOINT=pudb.set_trace
If you’re based in Windows, the command is different:
C:\> set PYTHONBREAKPOINT=pudb.set_trace
Alternatively, you can insert import pudb; pudb.set_trace() directly into your code.
Read the full article at https://realpython.com/python-packages/ »
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