ROS中DescribeResourcesRequest类返回类型错误及请求参数问题.

Alibaba Cloud Python Software Development Kit

The Alibaba Cloud Python Software Development Kit (SDK) allows you to access Alibaba Cloud services such as Elastic Compute Service (ECS), Object Storage Service (OSS), and Resource Access Management (RAM). You can access Alibaba Cloud services without the need to handle API related tasks, such as signing and constructing your requests.

This document introduces how to obtain and call Alibaba Cloud Python SDK.

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Prerequisites

To use Alibaba Cloud Python SDK, you must have an Alibaba Cloud account as well as an AccessKey.

The AccessKey is required when initializing AcsClient. You can create an AccessKey in the Alibaba Cloud console. For more information, see Create an AccessKey.

Note: To increase the security of your account, we recommend that you use the AccessKey of the RAM user to access Alibaba Cloud services.
To use Alibaba Cloud Python SDK to access the APIs of a product, you must first activate the product on the Alibaba Cloud console if required.
Alibaba Cloud Python SDK requires 2.7.x, and Python 3.x.

Install Python SDK

Alibaba Cloud Python SDK supports Python 2.7.x, and Python 3.x. Run python --version to check your version of Python.

You can install the Alibaba Cloud Python SDK using the following two methods. Regardless of which method and cloud service are used, the core library aliyun-python-sdk-core must be installed.

Install with pip

Python SDK uses a common package management tool named pip. If pip is not installed, see the pip user guide to install pip.

Run the following command to install the individual libraries of Alibaba Cloud services:
```
 # Install the core library
 pip install aliyun-python-sdk-core
 # Install the ECS management library
 pip install aliyun-python-sdk-ecs
 # Install the RDS management library
 pip install aliyun-python-sdk-rds
```

Use Python SDK

Import the required modules as follows:

from aliyunsdkcore.client import AcsClient
from aliyunsdkcore.acs_exception.exceptions import ClientException
from aliyunsdkcore.acs_exception.exceptions import ServerException
from aliyunsdkecs.request.v20140526 import DescribeInstancesRequest
from aliyunsdkecs.request.v20140526 import StopInstanceRequest

Initialize the AcsClient instance:
```
client = AcsClient(
    "<access-key-id>",
    "<access-key-secret>",
    "<region-id>"
)
```
where:
- access-key-id is the Accesskey ID for your account.
- access-key-secret is the AccessKey secret for your account.
- region-id is the ID of the region where the service is called. For a list of region IDs, see Regions and zones.
Note: The sequence of these parameters cannot be changed.

Initialize a request and print response.

# Initialize a request and set parameters
request = DescribeInstancesRequest.DescribeInstancesRequest()
request.set_PageSize(10)
# Print response
response = client.do_action_with_exception(request)
print response

Code example

The following example shows how to query a list of ECS instances in a specific region using DescribeInstances. Substitute the values for your-access-key-id, your-access-key-secret, and your-region-id.

# -*- coding: utf8 -*-

from aliyunsdkcore.client import AcsClient
from aliyunsdkcore.acs_exception.exceptions import ClientException
from aliyunsdkcore.acs_exception.exceptions import ServerException
from aliyunsdkecs.request.v20140526 import DescribeInstancesRequest
from aliyunsdkecs.request.v20140526 import StopInstanceRequest

# Initialize AcsClient instance
client = AcsClient(
  "<your-access-key-id>",
  "<your-access-key-secret>",
  "<your-region-id>"
)

# Initialize a request and set parameters
request = DescribeInstancesRequest.DescribeInstancesRequest()
request.set_PageSize(10)

# Print response
response = client.do_action_with_exception(request)
print response

HTTP DEBUG

To use the function HTTP DEBUG, you must set DEBUG in your environment variable, the corresponding value may be sdk or SDK.

The following example shows what the HTTP DEBUG do, which will help you debug your codes.

> GET /databases?RegionId=cn-hangzhou HTTP/1.1
> Host : ads.cn-hangzhou.aliyuncs.com
> User-Agent : AlibabaCloud (Windows 10;AMD64) Python/3.7.1 Core/2.13.1 python-requests/2.18.1
> accept-encoding : *
> Accept : application/json
> Connection : keep-alive
> x-sdk-invoke-type : normal
> x-acs-version : 2019-01-22
> x-acs-region-id : cn-hangzhou
> Date : Thu, 21 Feb 2019 08:00:50 GMT
> x-acs-signature-method : HMAC-SHA1
> x-acs-signature-version : 1.0
> Authorization : acs ...
> x-sdk-client : python/2.0.0

< HTTP/1.1 503 SERVICE_UNAVAILABLE
< Date : Thu, 21 Feb 2019 08:00:50 GMT
< Content-Type : application/json; charset=UTF-8
< Content-Length : 297
< Connection : keep-alive
< Access-Control-Allow-Origin : *
< Access-Control-Allow-Methods : POST, GET, OPTIONS
< Access-Control-Allow-Headers : X-Requested-With, X-Sequence, _aop_secret, _aop_signature
< Access-Control-Max-Age : 172800
< x-acs-request-id : 670F3D09-F8E7-4144-83C3-B56C35DA35ED
< Server : Jetty(7.2.2.v20101205)

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Alibaba Cloud Python Software Development Kit

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