Python实现MCP Server的完整Demo

mcp server

from fastmcp import FastMCP
import logging# 配置日志记录
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)mcp = FastMCP("DemoServer")@mcp.tool()
async def calculate(a: float, b: float, op: str) -> float:"""数学计算器（支持加减乘除）"""ops = {'+': a + b,'-': a - b,'*': a * b,'/': a / b if b != 0 else float('nan')}result = ops.get(op, float('nan'))logger.info(f"计算: {a}{op}{b}={result}")return result@mcp.resource("greet://{name}")
async def greeting(name: str) -> str:"""个性化问候服务"""return f"您好, {name}! 当前时间:2025-07-07"if __name__ == "__main__":# 启动服务（推荐HTTP模式便于远程调用）mcp.run(transport="streamable-http", port=8000)

mcp client

import asyncio
from mcp.client import HttpClientasync def main():async with HttpClient("http://localhost:8000") as client:# 调用计算工具calc_result = await client.call_tool("calculate", {"a": 5, "b": 3, "op": "*"})print(f"计算结果: {calc_result}")# 访问问候资源greet_result = await client.get_resource("greet://开发者")print(greet_result)asyncio.run(main())

关键配置说明：

1. 需先安装fastmcp库：uv pip install fastmcp httpx15
2. 支持三种传输模式：stdio（默认）、sse和streamable-http34
3. 工具方法需用@mcp.tool()装饰器注册，资源用@mcp.resource()9
4. 生产环境建议添加类型校验和错误处理