←back to thread

Show HN: Pyscn – Python code quality analyzer for vibe coders

(github.com)
136 points d-yoda | 1 comments | 05 Oct 25 13:22 UTC | HN request time: 0.208s | source

Hi HN! I built pyscn for Python developers in the vibe coding era. If you're using Cursor, Claude, or ChatGPT to ship Python code fast, you know the feeling: features work, tests pass, but the codebase feels... messy.

Common vibe coding artifacts:

• Code duplication (from copy-pasted snippets)

• Dead code from quick iterations

• Over-engineered solutions for simple problems

• Inconsistent patterns across modules

pyscn performs structural analysis:

• APTED tree edit distance + LSH

• Control-Flow Graph (CFG) analysis

• Coupling Between Objects (CBO)

• Cyclomatic Complexity

Try it without installation:

  uvx pyscn analyze .          # Using uv (fastest)
  pipx run pyscn analyze .     # Using pipx
  (Or install: pip install pyscn)
Built with Go + tree-sitter. Happy to dive into the implementation details!
Show context
eric15342335 ◴[05 Oct 25 16:37 UTC] No.45482976[source]▶
What about Pylint? iirc pylint has code duplication check as well. is it the same thing?
replies(1): >>45483662 #
1. d-yoda ◴[05 Oct 25 17:51 UTC] No.45483662[source]▶
Pylint's duplication check is text-based (compares lines), while pyscn uses tree edit distance on ASTs. This means pyscn can catch structural clones even when variable/function names differ.