本文介绍使用Python SDK的详细流程，包括环境准备、SDK获取和安装和快速使用三部分。

环境准备

  1. 要使用阿里云Python SDK，您需要一个云账号以及一对AccessKey ID和AccessKey Secret 。请在阿里云控制台中的AccessKey管理页面上创建和查看您的AccessKey，或者联系您的系统管理员。
  2. 要使用阿里云SDK访问某个产品的API，您需要事先在阿里云控制台 中开通这个产品。

SDK获取和安装

使用pip安装（推荐）

pip install aliyun-python-sdk-core # 安装阿里云SDK核心库
pip install aliyun-python-sdk-fnf # 安装Serverless工作流SDK

快速使用

下文将以创建一个流程，发起一次执行并获取执行详情为例展示如何使用Python SDK调用Serverless工作流服务。

请求方式 

# encoding: utf-8
import time

from aliyunsdkcore.client import AcsClient
from aliyunsdkcore.acs_exception.exceptions import ServerException
from aliyunsdkfnf.request.v20190315 import CreateFlowRequest
from aliyunsdkfnf.request.v20190315 import StartExecutionRequest
from aliyunsdkfnf.request.v20190315 import DescribeExecutionRequest
from aliyunsdkfnf.request.v20190315 import GetExecutionHistoryRequest

flow_definition_type = "FDL"
flow_name = "xxx"
flow_definition = "xxx"
flow_description = "some descriptions"
role_arn = "acs:ram::${Your_Account_ID}:${Your_Role}"
execution_name = "xxx"


def create_flow(fnf_cli):
    request = CreateFlowRequest.CreateFlowRequest()
    request.set_Type(flow_definition_type)
    request.set_Description(flow_description)
    request.set_Definition(flow_definition)
    request.set_RoleArn(role_arn)
    request.set_Name(flow_name)
    return fnf_cli.do_action_with_exception(request)


def start_execution(fnf_cli):
    request = StartExecutionRequest.StartExecutionRequest()
    request.set_FlowName(flow_name)
    request.set_ExecutionName(execution_name)
    return fnf_cli.do_action_with_exception(request)


def describe_execution(fnf_cli):
    request = DescribeExecutionRequest.DescribeExecutionRequest()
    request.set_FlowName(flow_name)
    request.set_ExecutionName(execution_name)
    return fnf_cli.do_action_with_exception(request)


def get_execution_history(fnf_cli):
    request = GetExecutionHistoryRequest.GetExecutionHistoryRequest()
    request.set_FlowName(flow_name)
    request.set_ExecutionName(execution_name)
    return fnf_cli.do_action_with_exception(request)

创建客户端并利用上述函数发起一系列调用。

说明 如果您需要不加改造进行调试的话，请将下述函数与上述请求方式代码块置于同一个文件中，避免在import时报错。 
def main():

    # 创建AcsClient实例
    client = AcsClient(
        "<your-access-key-id>",
        "<your-access-key-secret>",
        "<your-region-id>"
    )
    try:
        create_resp = create_flow(client)
        print(create_resp)

        start_resp = start_execution(client)
        print(start_resp)

        time.sleep(1)

        desc_resp = describe_execution(client)
        print(desc_resp)

        get_resp = get_execution_history(client)
        print(get_resp)
    except ServerException as e:
        print(e.get_request_id())


if __name__ == '__main__':
    main()