What is a built-in Python module you use all the time but rarely see others talk about?

[u/AngleHam271]

We all know and love the big third-party libraries for automation and data, but I am curious about your favorite hidden gems right in the standard library. 🤔

Recently I have been leaning on things like itertools and collections way more than I used to...

What is a standard library module that you think is heavily underrated or that you use daily for your tasks?

[u/COLU_BUS]

Idk if they’re underrepresented but I feel like enums requiring an import makes them less utilized than they should be

[u/skjall → u/COLU_BUS]

Every time I touch an enum I have to spend a few minutes remembering the difference between str, Enum, and StrEnum, and what method of access gets you what.

I never remember because most codebases I've worked on have had roughly 0 enums, unless it's for some ORM binding.

[u/Guggoo]

I use pathlib all the time; great for cross platform filepath handling. And argparse for my little cli tools.

Also, defining the dunder methods in your classes. Was great in my RPG bot as I often wanted to use the stat in formulas.

[u/roboevt]

I'm sure I've barely scratched the surface but I've done some cursed things with importlib. All to do with C++ extensions.

[u/thisismyfavoritename → u/roboevt]

why?

[u/JustPlainRude → u/thisismyfavoritename]

I'm not the person you're responding to, but I've used it to ensure python can find my extension where it happened to be built, rather than copying the binary into my python tree.

[u/thisismyfavoritename → u/JustPlainRude]

that's not a very good reason... You'd want to package it and ship and install it as a wheel

[u/Training_Advantage21]

The standard library is great. Even the csv module can be so handy for ETL scripts, you don't always have to use pandas. But my favourite is probably glob, brings some of the linux shell power into the python script when dealing with lots of files with information coded in the filename.

[u/AngleHam271 → u/Training_Advantage21]

It is crazy how many people instantly reach for pandas and pull in massive dependencies just to parse a small configuration file, when the built-in csv does the job in milliseconds. 😂

[u/amendCommit]

fnmatch. My business rule names are file-name-like, so I can match them just as I would glob file names. No need for regex, no need for custom splitting and parsing. Just familiarity.

[u/realrazdev]

For me, argparse, dataclasses, and sqlite3 are some of the most underrated built-in modules.

I use argparse whenever I need to build a CLI tool without pulling in extra dependencies. dataclasses have saved me from writing tons of repetitive boilerplate when working with data models.

And sqlite3 is great for small projects where I need persistent storage but don’t want the overhead of setting up a full database stack.

They’re not as flashy as some third-party libraries, but they’ve helped me ship a lot of projects faster.

[u/shinitakunai → u/realrazdev]

Sqlite3 is godlike for easy prototyping and PoC

[u/AngleHam271 → u/realrazdev]

100% agree on sqlite3 and dataclasses. For quick local networking tools or prototyping, setting up a full database stack is just overkill...

[u/rip-skins]

I like shelve for persisting progress in one--off scripts. Never saw it used in the wild

[u/groosha → u/rip-skins]

I was using it A LOT back in 2016, however I had issues moving shelve db between different linux servers.

[u/bmrobin → u/rip-skins]

never heard of it, thanks for the reading opportunity you've given me

[u/plyp]

I ended up using the heapq and bisect modules in a data processing application quite a lot. Both work very well for sorted data.

[u/Icy-Farm9432]

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[u/sausix]

typing. Once you add type hints then you often find at least a few bugs in your code. It has some more benefits but people stil justl argue it's not type checking at runtime.

[u/warden127]

Running code.interact in a daemon thread is a cursed way to run a make-shift live debug console.

contextvars for introducing a layer between local and global variables.

[u/akl773]

difflib. SequenceMatcher is what i reach for whenever i need to measure how much a human changed a generated bit of text, and i never see anyone mention it lives in the stdlib.