帮我用Python语言写一个azure function 实现返回指定路径下的blob对象

这是一个Azure Functions的Python示例，可以返回指定路径下的Blob对象：

import logging
import azure.functions as func
from azure.storage.blob import BlobServiceClient


def main(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

    # 获取请求参数中的路径
    path = req.params.get('path')
    if not path:
        try:
            req_body = req.get_json()
        except ValueError:
            pass
        else:
            path = req_body.get('path')

    # 如果路径为空，返回错误响应
    if not path:
        return func.HttpResponse(
             "Please pass a path on the query string or in the request body",
             status_code=400
        )

    # 连接Blob服务并获取指定路径下的Blob对象
    connection_string = "<your-storage-account-connection-string>"
    container_name = "<your-container-name>"
    blob_service_client = BlobServiceClient.from_connection_string(connection_string)
    container_client = blob_service_client.get_container_client(container_name)
    blob_client = container_client.get_blob_client(path)

    # 返回Blob对象的内容
    blob_content = blob_client.download_blob().content_as_text()
    return func.HttpResponse(blob_content)

运行这个Azure Function之前，需要先安装Azure Functions的Python库和Azure Storage Blob库：

pip install azure-functions
pip install azure-storage-blob

在Azure Portal中创建一个HTTP触发器的Azure Function，将上面的代码复制粘贴到函数代码编辑器中，然后保存并运行该函数。在浏览器中访问该函数的URL，并在查询参数中指定路径，即可返回该路径下的Blob对象的内容