mongomock

import mongomock # 1. Create a mock client instance client = mongomock.MongoClient() # 2. Access a database (it's created on first access) db = client.mydatabase # 3. Access a collection collection = db.mycollection # 4. Perform common MongoDB operations # Insert documents insert_result_one = collection.insert_one({"name": "Alice", "age": 30}) print(f"Inserted one: {insert_result_one.inserted_id}") insert_result_many = collection.insert_many([{"name": "Bob", "age": 25}, {"name": "Charlie", "age": 35}]) print(f"Inserted many IDs: {insert_result_many.inserted_ids}") # Find documents alice = collection.find_one({"name": "Alice"}) print(f"Found Alice: {alice}") all_docs = list(collection.find({})) print(f"All documents: {all_docs}") # Update documents update_result = collection.update_one({"name": "Bob"}, {"$set": {"age": 26, "city": "New York"}}) print(f"Matched {update_result.matched_count}, modified {update_result.modified_count} for Bob") bob = collection.find_one({"name": "Bob"}) print(f"Updated Bob: {bob}") # Delete documents delete_result = collection.delete_one({"name": "Charlie"}) print(f"Deleted count for Charlie: {delete_result.deleted_count}") charlie = collection.find_one({"name": "Charlie"}) print(f"Found Charlie (should be None): {charlie}") # Output: Found Charlie (should be None): None # The database and its collections are in-memory and reset with a new MongoClient instance.