---
title: "Discussion on \"How to Build an Online Judge, Part 2: Python Subprocesses Explained\" | Hashnode"
description: "Discussion on \"How to Build an Online Judge, Part 2: Python Subprocesses Explained\". Learn how Python subprocess can run child processes, send input, capture output, handle exit codes, and enforce timeouts."
url: "https://hashnode.com/posts/python-subprocesses-explained/6aabda495c61af02d3133d31"
---

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# [How to Build an Online Judge, Part 2: Python Subprocesses Explained](https://systemsfromscratch.hashnode.dev/python-subprocesses-explained?utm_source=hashnode&utm_medium=feed)

Learn how Python subprocess can run child processes, send input, capture output, handle exit codes, and enforce timeouts.

Sep 17 · 10 min read · systemsfromscratch.hashnode.dev  
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## Written by

[Siddharth Lalwani](https://hashnode.com/@siddharthlalwani)

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