feat: Add Python code verifiers for Mellea-generated code

CHANGELOG.md

@@ -1,30 +1,3 @@
-## [v0.2.0](https://github.com/generative-computing/mellea/releases/tag/v0.2.0) - 2025-11-19
-
-### Feature
-
-* Change backend functions to use async; add generate_from_raw ([`16b8aea`](https://github.com/generative-computing/mellea/commit/16b8aea1ab4fc18428adafb2c6106314d986c537))
-* Updates for intrinsics support ([#227](https://github.com/generative-computing/mellea/issues/227)) ([`52953a5`](https://github.com/generative-computing/mellea/commit/52953a507729e8683d8b027d7c1e6d70b2356955))
-* Add requirements and preconditions to gen slots ([#226](https://github.com/generative-computing/mellea/issues/226)) ([`f73d8e2`](https://github.com/generative-computing/mellea/commit/f73d8e23c57146b44e8b552f5e30315e353ff592))
-* MelleaSession.register for functional interface and MelleaSession.powerup for dynamic mixin (register all methods in a class) ([#224](https://github.com/generative-computing/mellea/issues/224)) ([`662cfcc`](https://github.com/generative-computing/mellea/commit/662cfcc99c365411c7dcee0d55fcd0cba21bd4b8))
-* Add secure Python code execution with llm-sandbox support ([#217](https://github.com/generative-computing/mellea/issues/217)) ([`9d12458`](https://github.com/generative-computing/mellea/commit/9d12458432db3c1172d79ffdcbfae50f2bf8b402))
-* Adds think budget-forcing ([#107](https://github.com/generative-computing/mellea/issues/107)) ([`a2e29e6`](https://github.com/generative-computing/mellea/commit/a2e29e633b9f470d3992335becb8231dc57d0d69))
-* Making generate_from_raw public ([#219](https://github.com/generative-computing/mellea/issues/219)) ([`7eae224`](https://github.com/generative-computing/mellea/commit/7eae2244763a4349e202e6b87502d23e111ea07e))
-* Conda/Mamba-based installation script ([#138](https://github.com/generative-computing/mellea/issues/138)) ([`6aea9dc`](https://github.com/generative-computing/mellea/commit/6aea9dc85b0147a22ff5a5553a75d9179958ce6e))
-* Adds a vllm backend ([#122](https://github.com/generative-computing/mellea/issues/122)) ([`21908e5`](https://github.com/generative-computing/mellea/commit/21908e5bbc6bfd3bfd6f84953cefb3f6a56fccf2))
-* Add the ability to run examples with pytest ([#198](https://github.com/generative-computing/mellea/issues/198)) ([`e30afe6`](https://github.com/generative-computing/mellea/commit/e30afe6148d68b6ef1d6aa3417823c7a51ff0743))
-* Ollama generate_from_raw uses existing event loop ([#204](https://github.com/generative-computing/mellea/issues/204)) ([`36a069f`](https://github.com/generative-computing/mellea/commit/36a069fb6f9912a25c5c8aa51a5fe46ce2e945d3))
-
-### Fix
-
-* Vllm format issues ([`abbde23`](https://github.com/generative-computing/mellea/commit/abbde236d4d5900a3717d4a6af4759743dcd21d9))
-* Some minor fixes ([#223](https://github.com/generative-computing/mellea/issues/223)) ([`7fa0891`](https://github.com/generative-computing/mellea/commit/7fa08915573ee696d230dffef5532be8b7d3b7e3))
-* Watsonx self._project_id not getting set ([#220](https://github.com/generative-computing/mellea/issues/220)) ([`10f6ffa`](https://github.com/generative-computing/mellea/commit/10f6ffa35ea089b2396d184b18a1efbac75b94a7))
-* Decomp subtask regex ([#218](https://github.com/generative-computing/mellea/issues/218)) ([`5ac34be`](https://github.com/generative-computing/mellea/commit/5ac34be51ee1d14678888d53c6374810a7ed5871))
-
-### Documentation
-
-* Adding pii m serve example ([#215](https://github.com/generative-computing/mellea/issues/215)) ([`54f13f4`](https://github.com/generative-computing/mellea/commit/54f13f4c0314ff21189a4a06051dfea84b5420d1))
-
 ## [v0.1.3](https://github.com/generative-computing/mellea/releases/tag/v0.1.3) - 2025-10-22
 
 ### Feature

LICENSE

@@ -187,7 +187,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2025 IBM Corp.
+   Copyright [yyyy] [name of copyright owner]
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

docs/examples/conftest.py

@@ -88,7 +88,7 @@ def runtest(self):
 
         if retcode != 0:
             raise ExampleTestException(
-                (f"Example failed with exit code {retcode}.\nStderr: {stderr}\n")
+                f"Example failed with exit code {retcode}.\nStderr: {stderr}\n"
             )
 
     def repr_failure(self, excinfo, style=None):

docs/examples/context/contexts_with_sampling.py

@@ -27,7 +27,7 @@
 print(f"Total Generation Attempts: {len(res.sample_generations)}")
 print()
 
-print(f"Getting index of another result.")
+print("Getting index of another result.")
 index = 0  # Just choose the first one.
 
 print(

docs/examples/image_text_models/vision_litellm_backend.py

@@ -1,6 +1,7 @@
 """Examples of using vision models with LiteLLM backend."""
 
 import os
+import pathlib
 
 import litellm
 from PIL import Image
@@ -9,7 +10,6 @@
 from mellea.backends.litellm import LiteLLMBackend
 from mellea.backends.openai import OpenAIBackend
 from mellea.stdlib.base import ImageBlock
-import pathlib
 
 # use LiteLLM to talk to Ollama or anthropic or.....
 m = MelleaSession(LiteLLMBackend("ollama/granite3.2-vision"))

docs/examples/image_text_models/vision_ollama_chat.py

@@ -1,6 +1,7 @@
 """Example of using Ollama with vision models with linear context."""
 
 import pathlib
+
 from PIL import Image
 
 from mellea import start_session

docs/examples/information_extraction/101_with_gen_slots.py

@@ -8,9 +8,7 @@
 
 @generative
 def extract_all_person_names(doc: str) -> list[str]:
-    """
-    Given a document, extract names of ALL mentioned persons. Return these names as list of strings.
-    """
+    """Given a document, extract names of ALL mentioned persons. Return these names as list of strings."""
 
 
 # ref: https://www.nytimes.com/2012/05/20/world/world-leaders-at-us-meeting-urge-growth-not-austerity.html

docs/examples/m_serve/pii_serve.py

@@ -2,8 +2,8 @@
 
 import spacy
 
-from cli.serve.models import ChatMessage
 import mellea
+from cli.serve.models import ChatMessage
 from mellea.backends.model_ids import IBM_GRANITE_4_MICRO_3B
 from mellea.stdlib.base import ModelOutputThunk
 from mellea.stdlib.requirement import req, simple_validate

docs/examples/safety/guardian.py

@@ -3,7 +3,7 @@
 from mellea import MelleaSession
 from mellea.backends import model_ids
 from mellea.backends.ollama import OllamaModelBackend
-from mellea.stdlib.base import ContextTurn, ModelOutputThunk, ChatContext
+from mellea.stdlib.base import ChatContext, ContextTurn, ModelOutputThunk
 from mellea.stdlib.chat import Message
 from mellea.stdlib.safety.guardian import GuardianCheck, GuardianRisk
 

docs/examples/safety/guardian_huggingface.py

@@ -6,8 +6,8 @@
 
 from mellea import MelleaSession
 from mellea.backends import model_ids
-from mellea.backends.ollama import OllamaModelBackend
 from mellea.backends.huggingface import LocalHFBackend
+from mellea.backends.ollama import OllamaModelBackend
 from mellea.stdlib.base import ChatContext, ModelOutputThunk, ModelToolCall
 from mellea.stdlib.chat import Message
 from mellea.stdlib.safety.guardian import GuardianCheck, GuardianRisk
@@ -45,7 +45,7 @@
 print(f"Guardian detected harm: {not validation_result[0]._result}")
 
 if validation_result[0]._reason:
-    print(f"\nGuardian feedback:")
+    print("\nGuardian feedback:")
     print(validation_result[0]._reason[:200] + "...")
 
 # Test 2: Groundedness detection

docs/examples/safety/repair_with_guardian.py

@@ -1,5 +1,4 @@
-"""
-RepairTemplateStrategy Example with Actual Function Call Validation
+"""RepairTemplateStrategy Example with Actual Function Call Validation
 Demonstrates how RepairTemplateStrategy repairs responses using actual function calls.
 """
 
@@ -78,10 +77,10 @@ def get_stock_price(symbol: str) -> str:
             if hasattr(m.backend, "formatter"):
                 try:
                     rendered = m.backend.formatter.print(action)
-                    print(f"  Instruction sent to model:")
-                    print(f"  ---")
+                    print("  Instruction sent to model:")
+                    print("  ---")
                     print(f"  {rendered}")
-                    print(f"  ---")
+                    print("  ---")
                 except Exception:
                     pass
 

docs/examples/sessions/creating_a_new_type_of_session.py

@@ -1,4 +1,5 @@
 from typing import Literal
+
 from PIL import Image as PILImage
 
 from mellea import MelleaSession