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.gitignore
.gitignore
 
 
README.md
README.md
 
 
environment.yml
environment.yml
 
 
langchain Cookbook Part 1 - Fundamentals_gkamradt.ipynb
langchain Cookbook Part 1 - Fundamentals_gkamradt.ipynb
 
 
langchain Cookbook Part 2 - Use Cases_gkamradt.ipynb
langchain Cookbook Part 2 - Use Cases_gkamradt.ipynb
 
 
langchain-00-intro.ipynb
langchain-00-intro.ipynb
 
 
langchain-01-prompt-templates.ipynb
langchain-01-prompt-templates.ipynb
 
 
langchain-02-chains.ipynb
langchain-02-chains.ipynb
 
 
langchain-03-conversational-memory.ipynb
langchain-03-conversational-memory.ipynb
 
 
langchain-03a-token-counter.ipynb
langchain-03a-token-counter.ipynb
 
 
langchain-04-chat.ipynb
langchain-04-chat.ipynb
 
 
langchain-05-retrieval-augmentation.ipynb
langchain-05-retrieval-augmentation.ipynb
 
 
langchain-06-agents.ipynb
langchain-06-agents.ipynb
 
 
langchain_101-1-streamlit_streaming_colinmcnamara.ipynb
langchain_101-1-streamlit_streaming_colinmcnamara.ipynb
 
 
langchain_101-2-streamlit_document_search_colinmcnamara.ipynb
langchain_101-2-streamlit_document_search_colinmcnamara.ipynb
 
 
langchain_101-3-search-chat_colinmcnamara.ipynb
langchain_101-3-search-chat_colinmcnamara.ipynb
 
 
langchain_101-4-streamlit_introduction_colinmcnamara.ipynb
langchain_101-4-streamlit_introduction_colinmcnamara.ipynb
 
 
langchain_103_QA_Using_Retriever_colinmcnamara.ipynb
langchain_103_QA_Using_Retriever_colinmcnamara.ipynb
 
 
langchain_Advanced_RAG_lucifertrj.ipynb
langchain_Advanced_RAG_lucifertrj.ipynb
 
 
langchain_Agents_SQL_Database_Agent_Nichite.ipynb
langchain_Agents_SQL_Database_Agent_Nichite.ipynb
 
 
langchain_Embedchain_RAG_lucifertrj.ipynb
langchain_Embedchain_RAG_lucifertrj.ipynb
 
 
langchain_LC_102-LangServe-pirate-speak_colinmcnamara.ipynb
langchain_LC_102-LangServe-pirate-speak_colinmcnamara.ipynb
 
 
langchain_Langchain_Introduction_colinmcnamara.ipynb
langchain_Langchain_Introduction_colinmcnamara.ipynb
 
 
langchain_OpenSourceLLMs_lucifertrj.ipynb
langchain_OpenSourceLLMs_lucifertrj.ipynb
 
 
langchain_dair-ai-prompt_engg-lecture.ipynb
langchain_dair-ai-prompt_engg-lecture.ipynb
 
 
langchain_helloworld.py
langchain_helloworld.py
 
 
langchain_marcus.py
langchain_marcus.py
 
 
langchain_memory.py
langchain_memory.py
 
 
langchain_pdf_query_prompt_engineering.ipynb
langchain_pdf_query_prompt_engineering.ipynb
 
 
langchain_v1_agent.py
langchain_v1_agent.py
 
 
langchain_v1_createagent.py
langchain_v1_createagent.py
 
 
langchain_v1_lcel.py
langchain_v1_lcel.py
 
 
langchain_v1_memory.py
langchain_v1_memory.py
 
 
langchain_v1_models.py
langchain_v1_models.py
 
 
langchain_v1_ner.py
langchain_v1_ner.py
 
 
langchain_v1_prompts.py
langchain_v1_prompts.py
 
 
langchain_v1_rag.py
langchain_v1_rag.py
 
 
langchain_v1_senitmentanalysis.py
langchain_v1_senitmentanalysis.py
 
 
langgraph_Understanding_LangGraph_A_Podcast_production_workflow_UgoOsuji.ipynb
langgraph_Understanding_LangGraph_A_Podcast_production_workflow_UgoOsuji.ipynb
 
 
langgraph_beginner_Learning_Menloparklab.ipynb
langgraph_beginner_Learning_Menloparklab.ipynb
 
 

README.md

LangChain Examples

LangChain code samples from multiple contributors, covering fundamentals through advanced RAG and agent patterns.

Setup

conda env create -f environment.yml
conda activate langchain

Contents

Cookbooks (recommended starting point)

  • langchain Cookbook Part 1 - Fundamentals_gkamradt.ipynb — chains, prompts, models, output parsers
  • langchain Cookbook Part 2 - Use Cases_gkamradt.ipynb — QA, summarization, extraction, evaluation

101 Series (colinmcnamara) — Streamlit integrations

Notebooks langchain_101-1 through langchain_103 build a streaming document-search chat UI step by step.

v1 API Scripts

Scripts prefixed langchain_v1_ use the current LangChain v0.2+ API (LCEL, RunnablePassthrough, etc.):

  • langchain_v1_lcel.py — LangChain Expression Language chains
  • langchain_v1_models.py — LLM and chat model wrappers
  • langchain_v1_memory.py — conversation memory
  • langchain_v1_agent.py / langchain_v1_createagent.py — ReAct agent creation

Advanced Topics

  • langchain_Advanced_RAG_lucifertrj.ipynb — hybrid search, reranking
  • langchain_Embedchain_RAG_lucifertrj.ipynb — Embedchain-based RAG
  • langchain_Agents_SQL_Database_Agent_Nichite.ipynb — SQL agent
  • langchain_dair-ai-prompt_engg-lecture.ipynb — prompt engineering patterns

Note on API versions

Files named langchain_v1_* use the current LCEL-based API. Older notebooks (colinmcnamara series) use the legacy LLMChain pattern — they still run but the API is deprecated.