# langchain-tutorial_code

**Repository Path**: mirrors_smallnest/langchain-tutorial_code

## Basic Information

- **Project Name**: langchain-tutorial_code
- **Description**: langchain examples
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-11-16
- **Last Updated**: 2026-02-08

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# LangChain 教程

本仓库包含一系列 LangChain 教程，根据模块组织，并参考了官方 LangChain 文档。
![](langchain3.png)

## 教程模块

- [01-安装](01-Installation/check_installation.py) - 介绍 LangChain 的安装与环境设置，包括模块化安装和 API 密钥配置。
- [02-LangChain 表达式语言 (LCEL)](02-LangChain-Expression-Language/)
  - [example_1_basic_chain.py](02-LangChain-Expression-Language/example_1_basic_chain.py)
  - [example_2_runnable_passthrough.py](02-LangChain-Expression-Language/example_2_runnable_passthrough.py)
  - [example_3_runnable_parallel.py](02-LangChain-Expression-Language/example_3_runnable_parallel.py)
- [03-LCEL 流式处理](03-LCEL-Streaming/)
  - [example_1_streaming_chain.py](03-LCEL-Streaming/example_1_streaming_chain.py)
  - [example_2_streaming_with_parser.py](03-LCEL-Streaming/example_2_streaming_with_parser.py)
- [04-LCEL 并行](04-LCEL-Parallelism/)
  - [example_1_parallel_chains.py](04-LCEL-Parallelism/example_1_parallel_chains.py)
  - [example_2_multiple_retrievers.py](04-LCEL-Parallelism/example_2_multiple_retrievers.py)
- [05-回调](05-Callbacks/)
  - [example_1_stdout_callback.py](05-Callbacks/example_1_stdout_callback.py)
  - [example_2_custom_callback.py](05-Callbacks/example_2_custom_callback.py)
- [06-序列化](06-Serialization/)
  - [example_1_save_load_prompt.py](06-Serialization/example_1_save_load_prompt.py)
  - [example_2_save_load_chain.py](06-Serialization/example_2_save_load_chain.py)
- [07-LLM 和聊天模型](07-LLMs-and-Chat-Models/)
  - [example_1_llm.py](07-LLMs-and-Chat-Models/example_1_llm.py)
  - [example_2_chat_model.py](07-LLMs-and-Chat-Models/example_2_chat_model.py)
  - [example_3_get_logprobs.py](07-LLMs-and-Chat-Models/example_3_get_logprobs.py)
- [08-函数调用](08-Function-Calling/)
  - [example_1_basic_function_call.py](08-Function-Calling/example_1_basic_function_call.py)
  - [example_2_tool_chain.py](08-Function-Calling/example_2_tool_chain.py)
- [09-自定义模型](09-Custom-Models/)
  - [example_1_custom_llm.py](09-Custom-Models/example_1_custom_llm.py)
  - [example_2_custom_chat_model.py](09-Custom-Models/example_2_custom_chat_model.py)
- [10-提示模板](10-Prompt-Templates/)
  - [example_1_prompt_template.py](10-Prompt-Templates/example_1_prompt_template.py)
  - [example_2_chat_prompt_template.py](10-Prompt-Templates/example_2_chat_prompt_template.py)
  - [example_3_pipeline_prompt_template.py](10-Prompt-Templates/example_3_pipeline_prompt_template.py)
- [11-聊天提示模板](11-Chat-Prompt-Templates/)
  - [example_1_placeholders.py](11-Chat-Prompt-Templates/example_1_placeholders.py)
  - [example_2_from_template.py](11-Chat-Prompt-Templates/example_2_from_template.py)
- [12-消息类型](12-Message-Types/)
  - [example_1_message_types.py](12-Message-Types/example_1_message_types.py)
- [13-示例选择器](13-Example-Selectors/)
  - [example_1_length_based_selector.py](13-Example-Selectors/example_1_length_based_selector.py)
  - [example_2_semantic_similarity_selector.py](13-Example-Selectors/example_2_semantic_similarity_selector.py)
- [14-输出解析器](14-Output-Parsers/)
  - [example_1_json_parser.py](14-Output-Parsers/example_1_json_parser.py)
  - [example_2_pydantic_parser.py](14-Output-Parsers/example_2_pydantic_parser.py)
  - [example_3_list_parser.py](14-Output-Parsers/example_3_list_parser.py)
- [15-自定义输出解析器](15-Custom-Output-Parsers/)
  - [example_1_custom_parser.py](15-Custom-Output-Parsers/example_1_custom_parser.py)
- [16-文档加载器](16-Document-Loaders/)
  - [example_1_web_loader.py](16-Document-Loaders/example_1_web_loader.py)
  - [example_2_file_loader.py](16-Document-Loaders/example_2_file_loader.py)
  - [example_3_csv_loader.py](16-Document-Loaders/example_3_csv_loader.py)
- [17-文本分割器](17-Text-Splitters/)
  - [example_1_recursive_splitter.py](17-Text-Splitters/example_1_recursive_splitter.py)
  - [example_2_token_splitter.py](17-Text-Splitters/example_2_token_splitter.py)
- [18-嵌入模型](18-Embedding-Models/)
  - [example_1_embedding_documents.py](18-Embedding-Models/example_1_embedding_documents.py)
  - [example_2_huggingface_embeddings.py](18-Embedding-Models/example_2_huggingface_embeddings.py)
- [19-向量存储](19-Vector-Stores/)
  - [example_1_faiss_in_memory.py](19-Vector-Stores/example_1_faiss_in_memory.py)
  - [example_2_chinese_embeddings.py](19-Vector-Stores/example_2_chinese_embeddings.py)
- [20-检索器](20-Retrievers/)
  - [example_1_basic_retriever.py](20-Retrievers/example_1_basic_retriever.py)
  - [example_2_multi_query_retriever.py](20-Retrievers/example_2_multi_query_retriever.py)
  - [example_2_search_options.py](20-Retrievers/example_2_search_options.py)
  - [example_3_ensemble_retriever.py](20-Retrievers/example_3_ensemble_retriever.py)
  - [example_3_huggingface_retriever.py](20-Retrievers/example_3_huggingface_retriever.py)
- [21-索引](21-Indexing/)
  - [example_1_basic_indexing.py](21-Indexing/example_1_basic_indexing.py)
  - [example_2_langchain_index.py](21-Indexing/example_2_langchain_index.py)
- [22-链](22-Chains/)
  - [example_1_basic_agent.py](22-Chains/example_1_basic_agent.py)
  - [example_1_simple_lcel_chain.py](22-Chains/example_1_simple_lcel_chain.py)
  - [example_2_agent_with_memory.py](22-Chains/example_2_agent_with_memory.py)
  - [example_2_rag_chain.py](22-Chains/example_2_rag_chain.py)
  - [example_3_chain_with_history.py](22-Chains/example_3_chain_with_history.py)
- [23-代理](23-Agents/)
  - [example_1_basic_agent.py](23-Agents/example_1_basic_agent.py)
  - [example_2_agent_with_memory.py](23-Agents/example_2_agent_with_memory.py)
- [24-工具](24-Tools/)
  - [example_1_custom_tool.py](24-Tools/example_1_custom_tool.py)
  - [example_2_structured_tool.py](24-Tools/example_2_structured_tool.py)
- [25-工具包](25-Toolkits/)
  - [example_1_sql_toolkit.py](25-Toolkits/example_1_sql_toolkit.py)
- [26-内存](26-Memory/)
  - [example_1_buffer_memory.py](26-Memory/example_1_buffer_memory.py)
  - [example_2_message_history.py](26-Memory/example_2_message_history.py)
- [27-多模态](27-Multimodal/)
  - [example_1_multimodal_prompt.py](27-Multimodal/example_1_multimodal_prompt.py)
- [28-LangGraph](28-LangGraph/)
  - [example_1_basic_graph.py](28-LangGraph/example_1_basic_graph.py)
- [29-MCP 适配器](29-MCP-Adapters/)
  - [example_1_basic_mcp_tool.py](29-MCP-Adapters/example_1_basic_mcp_tool.py)
  - [example_1_quickstart_math.py](29-MCP-Adapters/example_1_quickstart_math.py)
  - [example_2_multi_server_client.py](29-MCP-Adapters/example_2_multi_server_client.py)
  - [example_3_langgraph_state_graph.py](29-MCP-Adapters/example_3_langgraph_state_graph.py)
  - [example_4_langchain_to_fastmcp.py](29-MCP-Adapters/example_4_langchain_to_fastmcp.py)