{"id":27156,"library":"montydb","title":"MontyDB","description":"Monty, Mongo tinified. MongoDB implemented in Python. Current version 2.5.6, supports Python >=3.7. Released irregularly.","status":"active","version":"2.5.6","language":"python","source_language":"en","source_url":"https://github.com/davidlatwe/montydb","tags":["mongodb","database","embedded","nosql","testing"],"install":[{"cmd":"pip install montydb","lang":"bash","label":"Default installation"}],"dependencies":[],"imports":[{"note":"'monty' is not a valid module; must use 'montydb'.","wrong":"from monty import MontyClient","symbol":"MontyClient","correct":"from montydb import MontyClient"},{"note":"MontyDB mimics pymongo but is a separate library; using pymongo will connect to a real MongoDB instead.","wrong":"from pymongo import MongoClient","symbol":"connect","correct":"from montydb import connect"}],"quickstart":{"code":"from montydb import MontyClient, connect\n\n# Using MontyClient with in-memory storage\nclient = MontyClient()\ndb = client.test_db\ncollection = db.test_collection\ncollection.insert_one({'name': 'Alice', 'age': 30})\nprint(collection.find_one({'name': 'Alice'}))","lang":"python","description":"Create an in-memory database and perform basic CRUD."},"warnings":[{"fix":"Use 'from montydb import MontyClient' or 'from montydb import connect'.","message":"MontyDB's 'import montydb' is correct, but users often mistakenly import 'monty' or 'montydb.client'.","severity":"gotcha","affected_versions":"all"},{"fix":"Check the documentation for supported operators; use native Python logic if needed.","message":"MontyDB is not fully compatible with all MongoDB features; aggregation pipelines with unsupported operators may raise NotImplementedError.","severity":"gotcha","affected_versions":"all"},{"fix":"Back up your montydb data directory before upgrading, or use in-memory mode temporarily.","message":"Version 2.5.0 introduced support for mongoengine but changed internal storage engine; existing databases may need migration.","severity":"breaking","affected_versions":">=2.5.0"},{"fix":"Use MontyClient(repository='path/to/data') for persistent file-based storage.","message":"In-memory databases are per-process; they do not persist after restart. Users expecting persistence must specify a storage path.","severity":"gotcha","affected_versions":"all"}],"env_vars":null,"last_verified":"2026-05-01T00:00:00.000Z","next_check":"2026-07-30T00:00:00.000Z","problems":[{"fix":"Run 'pip install montydb' and use 'from montydb import MontyClient'.","cause":"Incorrect import; users attempt 'import monty' instead of 'montydb'.","error":"ModuleNotFoundError: No module named 'monty'"},{"fix":"Use MontyClient from montydb, not pymongo's MongoClient.","cause":"Using pymongo's MongoClient with MontyDB's connection string. MontyDB does not start a real MongoDB server.","error":"pymongo.errors.ServerSelectionTimeoutError: No primary server found"},{"fix":"Replace unsupported operators with equivalent Python code or use simpler queries.","cause":"Attempt to use aggregation pipeline operators not implemented by MontyDB (e.g., $collStats).","error":"NotImplementedError: The 'collStats' command is not supported"}],"ecosystem":"pypi","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}