To use the Classic SDK of an Alibaba Cloud service, you must ensure that the aliyun-python-sdk-core is installed. If you want to use the Classic SDK of Elastic Compute Service (ECS), you must install aliyun-python-sdk-core and aliyun-python-sdk-ecs. After you install aliyun-python-sdk-ecs, aliyun-python-sdk-core is automatically installed.
Run the pip command to install the Classic SDK of ECS as a dependency
pip install aliyun-python-sdk-ecs