ECO-CMP-PY-001 — String concatenation in loops¶

Category: Computation (CMP)
Family: Python (PY)
Layer: Code
Tier: 1
Severity: warning
Tags: python, allocations, hot-path
Legacy ID: ECO-PY-001

Summary¶

Repeated string concatenation in a loop increases allocations and CPU.

Avoids unnecessary intermediate string objects that compound under load.

{
  "confidence": 0.7,
  "notes": "Most visible in tight loops / hot paths.",
  "type": "cpu"
}

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

{
  "guidance": "Use list accumulation + join(), or StringIO.",
  "tradeoffs": "Slightly more verbose."
}

{
  "system_layers": [
    "code"
  ]
}