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Build (Python): In-Memory File System

MediumPython · unittest

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Spec

Implement FileSystem in fs/memfs.py (contract in the docstring).

The core idea is a trie of path segments: each node has children: dict, is_file and content. Most methods are "walk the path, then do one thing". du is a recursive sum.

Concepts

triesrecursionpath parsingerror semantics

Workflow that wins the OA: run the tests → read the first failure → open the file it points to → form one hypothesis → change one thing → rerun. Use the Request flow tab to see exactly which middleware/handler/DB calls ran.

Explorer

fs

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