The Right Way to Run Shell Commands from Python

https://martinheinz.dev/blog/98

by heinzm • 3 years ago

19 11 3 years ago

martinheinz.dev

sunk1st• 3 years ago

“`os` is bad, don’t use it.” Ok, but why? What’s wrong with it?

prepend• 3 years ago

This was my question. What’s wrong with using os.system to run commands?

whoomp123422• 3 years ago

This is a problem I have very frquently when writing python scripts on my local box. Sh module seems like exactly what I need, but does it work on wandows?

lalopalota• 3 years ago

sh relies on various Unix system calls and only works on Unix-like operating systems - Linux, macOS, BSDs etc. Specifically, Windows is not supported.

from: https://amoffat.github.io/sh/

whoomp123422• 3 years ago

that was my sus. thanks for confirming

iamwpj• 3 years ago

I wish I could type the face I made when the alternative to import os is to install a package from pip. The most reliable Python is written only using builtins.

webnrrd2k• 3 years ago

Maybe I value cross-platform too highly, but I don't see the use of this post... Am I missing something? The claim is that there should be only one way to do it in Python. But then goes on to describe a way that doesn't even work on a major platform.

I've worked on a project recently, a rough prototype, that executes a vast amount of commands via subprocess[1]. I've been very happy with the results of subprocess.popen(). It works well on Linux, Macs, and windows with minimal tweaking.

[1] https://docs.python.org/3/library/subprocess.html

BugsJustFindMe• 3 years ago

The claim is that there should be only one way to do it in Python.

Python developers and failing to adhere to this part of the Zen of Python. Name a more iconic duo.

badrabbit• 3 years ago

I have seen this advice many times but I end up using os.system() 70% of the time. If subprocess and other methods were smart enough to support running something like " ls -l aS " without requiring additional parameters/handling I would use them. If I was shipping a user facing production app I would be using the more recommended apis as well. But when I just need a freaking command run and I don't care about the results and there is no dynamic parameter in the command why would I add all that code and complexity? Most of my use cases could also be done as a bash script except python is nicer/leaner so i prefer it instead.

leemelone• 3 years ago

I think the correct answer is "don't"

karmakaze• 3 years ago

When I read a post like this, I don't mind the article being written, or votes by those who found it interesting. Everyone's learning. What gets me is that there's no way to not make it show highly ranked. Moderation via comments after posts rank up doesn't scale.

The Right Way to Run Shell Commands from Python

Related Stories