ECO-CMP-PY-010 — Inefficient data structure choice¶

Category: Computation (CMP)
Family: Python (PY)
Layer: Code
Tier: 1
Severity: note
Tags: python, data-structures
Legacy ID: ECO-PY-010

Summary¶

Using lists for membership tests instead of sets/dicts increases CPU time.

O(n) lookups in loops are a common silent perf killer.

{
  "confidence": 0.7,
  "notes": "High impact when lookups are frequent.",
  "type": "cpu"
}

{
  "languages": [
    "python"
  ],
  "method": "ast"
}

{
  "guidance": "Use set/dict for membership-heavy operations.",
  "tradeoffs": "Memory tradeoff for speed."
}

{
  "system_layers": [
    "code"
  ]
}