Update config.py

config.py

@@ -23,4 +23,24 @@ _BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 STORE_PATH = os.environ.get("STORE_PATH", os.path.join(_BASE_DIR, "data", "progress.json"))
 
 SUPPORTED_LANGUAGES = ["python", "javascript", "java", "cpp"]
-EXPLANATION_LEVELS = ["Beginner", "Intermediate", "Expert"]
+EXPLANATION_LEVELS = ["Beginner", "Intermediate", "Expert"]
+
+# ---- Judge0 (real execution for JavaScript, C++, and Java; optionally Python too) ----
+# Default: the free public Judge0 CE instance (ce.judge0.com) - no key
+# required, community rate limits apply, fine for a hackathon/demo workload.
+# Set JUDGE0_RAPIDAPI_KEY to switch to the RapidAPI-hosted instance instead
+# (its own free tier, higher limits) - see README for setup steps.
+JUDGE0_RAPIDAPI_KEY = os.environ.get("JUDGE0_RAPIDAPI_KEY", "")
+JUDGE0_BASE_URL = (
+    "https://judge0-ce.p.rapidapi.com"
+    if JUDGE0_RAPIDAPI_KEY
+    else "https://ce.judge0.com"
+)
+JUDGE0_TIMEOUT_SECONDS = float(os.environ.get("JUDGE0_TIMEOUT_SECONDS", "10.0"))
+
+# Which engine handles Python specifically:
+#   "local"  (default) - the existing subprocess sandbox. Fast, free, no
+#             network dependency - safest choice for a live demo.
+#   "judge0" - routes Python through Judge0 too, for full engine parity with
+#             C++/Java. Adds network latency + a dependency on Judge0 uptime.
+PYTHON_EXECUTION_ENGINE = os.environ.get("PYTHON_EXECUTION_ENGINE", "local").strip().lower()