chore(ci): pin ruff and add pre-commit hooks (PROF-15511)

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           python-version: "3.11"
       - name: Install ruff
-        run: pip install --no-cache-dir ruff
+        run: pip install --no-cache-dir ruff==0.15.5
       - name: Run ruff format check
         run: ruff format --check .
       - name: Run ruff lint check

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+# Lightweight Python formatting/lint for scenario workloads. Matches the ruff job in ci.yml.
+# Local: ./scripts/lint (check) or ./scripts/format (auto-fix)
+# Optional hooks (skipped when core.hooksPath is set): pip install pre-commit && pre-commit install
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.5
+    hooks:
+      - id: ruff-format
+      - id: ruff
+        args: [--fix]

scenarios/python_safe_point_bias_3.11/README.md

@@ -10,6 +10,7 @@ Verifies that the Python profiler correctly attributes CPU time to `slow_method`
 def empty_method() -> None:
     pass
 
+
 def slow_method() -> None:
     while time() < end_time:
         x = "h" + "e" + "l" + "l" + "o" + ","

scripts/format

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$root"
+
+if ! command -v ruff >/dev/null 2>&1; then
+  echo "ruff not found; install with: pip install ruff==0.15.5" >&2
+  exit 1
+fi
+
+targets=("$@")
+if [ "${#targets[@]}" -eq 0 ]; then
+  targets=(".")
+fi
+
+ruff format "${targets[@]}"
+ruff check --fix "${targets[@]}"

scripts/lint

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Matches the ruff job in .github/workflows/ci.yml (see also scripts/format).
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$root"
+
+if ! command -v ruff >/dev/null 2>&1; then
+  echo "ruff not found; install with: pip install ruff==0.15.5" >&2
+  exit 1
+fi
+
+targets=("$@")
+if [ "${#targets[@]}" -eq 0 ]; then
+  targets=(".")
+fi
+
+ruff format --check "${targets[@]}"
+ruff check "${targets[@]}"