From 10a6a7051a35100af042eaf6de1b44a833fce6c6 Mon Sep 17 00:00:00 2001
From: kennethcheng <a1478925630@163.com>
Date: Mon, 13 Apr 2026 20:57:38 +0800
Subject: [PATCH] v0.0.4 parser

---
 README.md                  | 11 ++++++++++-
 parser/json_parser_demo.py | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 parser/json_parser_demo.py

diff --git a/README.md b/README.md
index 46d6658..aa6a164 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # LangChain Learning
 
-[![](https://img.shields.io/badge/version-0.0.3-blue.svg)](https://github.com/your-repo/langchain-learning)
+[![](https://img.shields.io/badge/version-0.0.4-blue.svg)](https://github.com/your-repo/langchain-learning)
 [![](https://img.shields.io/badge/python-3.11+-green.svg)](https://www.python.org/)
 [![](https://img.shields.io/badge/LangChain-v1.2-orange.svg)](https://www.langchain.com/)
 
@@ -11,6 +11,7 @@
 - **多 LLM 集成**：支持 OpenAI API、SiliconFlow 及 LangChain 抽象层
 - **流式响应**：实时流式输出，带来更好的使用体验
 - **Prompt 工程**：多种 Prompt 模板构建方式
+- **输出解析**：支持 JSON 等格式解析
 - **Token 用量追踪**：轻松监控 API 调用消耗
 - **实战示例**：从基础到进阶的使用模式
 
@@ -50,6 +51,12 @@ SILICONFLOW_BASE_URL=https://api.siliconflow.cn/v1
 | Few-shot Learning | `python prompt/fewshot_demo.py` | 带示例的少样本提示学习 |
 | 从文件加载 Prompt | `python prompt/promt_from_file.py` | 从 YAML 文件加载提示词模板 |
 
+**输出解析示例**
+
+| 示例 | 命令 | 说明 |
+|------|------|------|
+| JSON 解析器 | `python parser/json_parser_demo.py` | 使用 JsonOutputParser 解析 LLM 输出 |
+
 **Token 用量示例**
 
 | 示例 | 命令 | 说明 |
@@ -70,6 +77,8 @@ langchain-learning/
 │   ├── fewshot_demo.py                # Few-shot Learning 示例
 │   ├── promt_from_file.py             # 从文件加载 Prompt
 │   └── prompt_from_file.yaml          # Prompt 模板文件
+├── parser/
+│   └── json_parser_demo.py            # JSON 输出解析示例
 ├── token/
 │   └── token_demo.py                  # Token 用量追踪示例
 ├── main.py                            # 入口文件
diff --git a/parser/json_parser_demo.py b/parser/json_parser_demo.py
new file mode 100644
index 0000000..a3c61df
--- /dev/null
+++ b/parser/json_parser_demo.py
@@ -0,0 +1,38 @@
+import logging
+
+from langchain_core.output_parsers import JsonOutputParser
+from langchain_core.prompts import PromptTemplate
+from langchain_openai import ChatOpenAI
+import os
+import dotenv
+
+logging.basicConfig(
+    level=logging.DEBUG,
+    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+)
+dotenv.load_dotenv()
+
+## 设置环境变量
+os.environ['OPENAI_API_KEY'] = os.getenv("SILICONFLOW_API_KEY")
+os.environ['OPENAI_BASE_URL'] = os.getenv("SILICONFLOW_BASE_URL")
+
+# 默认的 'model_name': 'deepseek-ai/DeepSeek-V3.1',
+llm = ChatOpenAI(model="deepseek-ai/DeepSeek-R1-0528-Qwen3-8B")
+
+
+
+output_parser = JsonOutputParser()
+print(output_parser.get_format_instructions())
+
+message = "讲一个简短的笑话"
+prompt = PromptTemplate(
+    template="用中文回答用户的请求。\n{format_instruction}\n{query}",
+    input_variables = ["query"],
+    partial_variables={"format_instruction":output_parser.get_format_instructions()}
+)
+
+chain = prompt | llm | output_parser
+
+response = chain.invoke({"query":message})
+print(response)
+print(type(response))
\ No newline at end of file