How to Build a Universal Long-Term Memory Layer for AI Agents Using Mem0 and OpenAI

!pip install mem0ai openai rich chromadb -q   import os import getpass from datetime import datetime   print("=" * 60) print("🔐  MEM0 Advanced Tutorial — API Key Setup") print("=" * 60)   OPENAI_API_KEY = getpass.getpass("Enter your OpenAI API key: ") os.environ["OPENAI_API_KEY"] = OPENAI_API_KEY   print("n✅ API key set!n")   from openai import OpenAI from mem0 import Memory from rich.console import Console from rich.panel import Panel from rich.table import Table from rich.markdown import Markdown from rich import print as rprint import json   console = Console() openai_client = OpenAI()   console.rule("[bold cyan]MODULE 1: Basic Memory Setup[/bold cyan]")   memory = Memory()   print(Panel(    "[green]✓ Memory instance created with default config[/green]n"    "  • LLM: gpt-4.1-nano (OpenAI)n"    "  • Vector Store: ChromaDB (local)n"    "  • Embedder: text-embedding-3-small",    title="Memory Config", border_style="cyan" )) 

console.rule("[bold cyan]MODULE 2: Adding & Retrieving Memories[/bold cyan]")   USER_ID = "alice_tutorial"   print("n📝 Adding memories for user:", USER_ID)   conversations = [    [        {"role": "user", "content": "Hi! I'm Alice. I'm a software engineer who loves Python and machine learning."},        {"role": "assistant", "content": "Nice to meet you Alice! Python and ML are great areas to be in."}    ],    [        {"role": "user", "content": "I prefer dark mode in all my IDEs and I use VS Code as my main editor."},        {"role": "assistant", "content": "Good to know! VS Code with dark mode is a popular combo."}    ],    [        {"role": "user", "content": "I'm currently building a RAG pipeline for my company's internal docs. It's for a fintech startup."},        {"role": "assistant", "content": "That's exciting! RAG pipelines are really valuable for enterprise use cases."}    ],    [        {"role": "user", "content": "I have a dog named Max and I enjoy hiking on weekends."},        {"role": "assistant", "content": "Max sounds lovely! Hiking is a great way to recharge."}    ], ]   results = [] for i, convo in enumerate(conversations):    result = memory.add(convo, user_id=USER_ID)    extracted = result.get("results", [])    for mem in extracted:        results.append(mem)    print(f"  Conversation {i+1}: {len(extracted)} memory(ies) extracted")   print(f"n✅ Total memories stored: {len(results)}")

console.rule("[bold cyan]MODULE 3: Semantic Search[/bold cyan]")   queries = [    "What programming languages does the user prefer?",    "What is Alice working on professionally?",    "What are Alice's hobbies?",    "What tools and IDE does Alice use?", ]   for query in queries:    search_results = memory.search(query=query, user_id=USER_ID, limit=2)    table = Table(title=f"🔍 Query: {query}", show_lines=True)    table.add_column("Memory", style="white", max_width=60)    table.add_column("Score", style="green", justify="center")       for r in search_results.get("results", []):        score = r.get("score", "N/A")        score_str = f"{score:.4f}" if isinstance(score, float) else str(score)        table.add_row(r["memory"], score_str)       console.print(table)    print()   console.rule("[bold cyan]MODULE 4: CRUD Operations[/bold cyan]")   all_memories = memory.get_all(user_id=USER_ID) memories_list = all_memories.get("results", [])   print(f"n📚 All memories for '{USER_ID}':") for i, mem in enumerate(memories_list):    print(f"  [{i+1}] ID: {mem['id'][:8]}...  →  {mem['memory']}")   if memories_list:    first_id = memories_list[0]["id"]    original_text = memories_list[0]["memory"]       print(f"n✏️  Updating memory: '{original_text}'")    memory.update(memory_id=first_id, data=original_text + " (confirmed)")       updated = memory.get(memory_id=first_id)    print(f"   After update: '{updated['memory']}'")

console.rule("[bold cyan]MODULE 5: Memory-Augmented Chat[/bold cyan]")   def chat_with_memory(user_message: str, user_id: str, session_history: list) -> str:       relevant = memory.search(query=user_message, user_id=user_id, limit=5)    memory_context = "n".join(        f"- {r['memory']}" for r in relevant.get("results", [])    ) or "No relevant memories found."       system_prompt = f"""You are a highly personalized AI assistant. You have access to long-term memories about this user.   RELEVANT USER MEMORIES: {memory_context}   Use these memories to provide context-aware, personalized responses. Be natural — don't explicitly announce that you're using memories."""       messages = [{"role": "system", "content": system_prompt}]    messages.extend(session_history[-6:])    messages.append({"role": "user", "content": user_message})       response = openai_client.chat.completions.create(        model="gpt-4.1-nano-2025-04-14",        messages=messages    )    assistant_response = response.choices[0].message.content       exchange = [        {"role": "user", "content": user_message},        {"role": "assistant", "content": assistant_response}    ]    memory.add(exchange, user_id=user_id)       session_history.append({"role": "user", "content": user_message})    session_history.append({"role": "assistant", "content": assistant_response})       return assistant_response     session = [] demo_messages = [    "Can you recommend a good IDE setup for me?",    "What kind of project am I currently building at work?",    "Suggest a weekend activity I might enjoy.",    "What's a good tech stack for my current project?", ]   print("n🤖 Starting memory-augmented conversation with Alice...n")   for msg in demo_messages:    print(Panel(f"[bold yellow]User:[/bold yellow] {msg}", border_style="yellow"))    response = chat_with_memory(msg, USER_ID, session)    print(Panel(f"[bold green]Assistant:[/bold green] {response}", border_style="green"))    print()

console.rule("[bold cyan]MODULE 6: Multi-User Memory Isolation[/bold cyan]")   USER_BOB = "bob_tutorial"   bob_conversations = [    [        {"role": "user", "content": "I'm Bob, a data scientist specializing in computer vision and PyTorch."},        {"role": "assistant", "content": "Great to meet you Bob!"}    ],    [        {"role": "user", "content": "I prefer Jupyter notebooks over VS Code, and I use Vim keybindings."},        {"role": "assistant", "content": "Classic setup for data science work!"}    ], ]   for convo in bob_conversations:    memory.add(convo, user_id=USER_BOB)   print("n🔐 Testing memory isolation between Alice and Bob:n")   test_query = "What programming tools does this user prefer?"   alice_results = memory.search(query=test_query, user_id=USER_ID, limit=3) bob_results = memory.search(query=test_query, user_id=USER_BOB, limit=3)   print("👩 Alice's memories:") for r in alice_results.get("results", []):    print(f"   • {r['memory']}")   print("n👨 Bob's memories:") for r in bob_results.get("results", []):    print(f"   • {r['memory']}")

print("n✅ Memory isolation confirmed — users cannot see each other's data.")   console.rule("[bold cyan]MODULE 7: Custom Configuration[/bold cyan]")   custom_config = {    "llm": {        "provider": "openai",        "config": {            "model": "gpt-4.1-nano-2025-04-14",            "temperature": 0.1,            "max_tokens": 2000,        }    },    "embedder": {        "provider": "openai",        "config": {            "model": "text-embedding-3-small",        }    },    "vector_store": {        "provider": "chroma",        "config": {            "collection_name": "advanced_tutorial_v2",            "path": "https://www.marktechpost.com/tmp/chroma_advanced",        }    },    "version": "v1.1" }   custom_memory = Memory.from_config(custom_config)   print(Panel(    "[green]✓ Custom memory instance created[/green]n"    "  • LLM: gpt-4.1-nano with temperature=0.1n"    "  • Embedder: text-embedding-3-smalln"    "  • Vector Store: ChromaDB at /tmp/chroma_advancedn"    "  • Collection: advanced_tutorial_v2",    title="Custom Config Applied", border_style="magenta" ))   custom_memory.add(    [{"role": "user", "content": "I'm a researcher studying neural plasticity and brain-computer interfaces."}],    user_id="researcher_01" )   result = custom_memory.search("What field does this person work in?", user_id="researcher_01", limit=2) print("n🔍 Custom memory search result:") for r in result.get("results", []):    print(f"   • {r['memory']}")   console.rule("[bold cyan]MODULE 8: Memory History[/bold cyan]")   all_alice = memory.get_all(user_id=USER_ID) alice_memories = all_alice.get("results", [])   table = Table(title=f"📋 Full Memory Profile: {USER_ID}", show_lines=True, width=90) table.add_column("#", style="dim", width=3) table.add_column("Memory ID", style="cyan", width=12) table.add_column("Memory Content", style="white") table.add_column("Created At", style="yellow", width=12)   for i, mem in enumerate(alice_memories):    mem_id = mem["id"][:8] + "..."    created = mem.get("created_at", "N/A")    if created and created != "N/A":        try:            created = datetime.fromisoformat(created.replace("Z", "+00:00")).strftime("%m/%d %H:%M")        except:            created = str(created)[:10]    table.add_row(str(i+1), mem_id, mem["memory"], created)   console.print(table)   console.rule("[bold cyan]MODULE 9: Memory Deletion[/bold cyan]")   all_mems = memory.get_all(user_id=USER_ID).get("results", []) if all_mems:    last_mem = all_mems[-1]    print(f"n🗑️  Deleting memory: '{last_mem['memory']}'")    memory.delete(memory_id=last_mem["id"])       updated_count = len(memory.get_all(user_id=USER_ID).get("results", []))    print(f"✅ Deleted. Remaining memories for {USER_ID}: {updated_count}")   console.rule("[bold cyan]✅ TUTORIAL COMPLETE[/bold cyan]")   summary = """ # 🎓 Mem0 Advanced Tutorial Summary   ## What You Learned: 1. **Basic Setup** — Instantiate Memory with default & custom configs 2. **Add Memories** — From conversations (auto-extracted by LLM) 3. **Semantic Search** — Retrieve relevant memories by natural language query 4. **CRUD Operations** — Get, Update, Delete individual memories 5. **Memory-Augmented Chat** — Full pipeline: retrieve → respond → store 6. **Multi-User Isolation** — Separate memory namespaces per user_id 7. **Custom Configuration** — Custom LLM, embedder, and vector store 8. **Memory History** — View full memory profiles with timestamps 9. **Cleanup** — Delete specific or all memories   ## Key Concepts: - `memory.add(messages, user_id=...)` - `memory.search(query, user_id=...)` - `memory.get_all(user_id=...)` - `memory.update(memory_id, data)` - `memory.delete(memory_id)` - `Memory.from_config(config)`   ## Next Steps: - Swap ChromaDB for Qdrant, Pinecone, or Weaviate - Use the hosted Mem0 Platform (app.mem0.ai) for production - Integrate with LangChain, CrewAI, or LangGraph agents - Add `agent_id` for agent-level memory scoping """   console.print(Markdown(summary))