首先提供一版可用的Python版本的OpenAPI调用示例，使用前需要先替换使用自己的AK/SK，并把ctecs-global.ctapi.ctyun.cn前面加上https和冒号以及双斜线（发表文章禁止携带）：

# -*- coding: utf8 -*-
import urllib
import datetime
import requests
import json
import hashlib
import base64
import hmac
import datetime
import uuid
import os
import sys

if sys.version_info.major == 2:
    from urllib import quote

    reload(sys)
    sys.setdefaultencoding('utf8')
    VERSION = '2'
else:
    VERSION = '3'
    from urllib.parse import quote
    from importlib import reload
from urllib3 import encode_multipart_formdata
from collections import OrderedDict

reload(sys)

METHOD_GET = 'GET'
METHOD_POST = 'POST'
file = False
# 官网accessKey
ak = '替换成您自己的AK'
# 官网securityKey
sk = '替换成您自己的SK'


def hmac_sha256(secret, data):
    if type(secret) == bytes:
        secret = bytearray(secret)
    else:
        secret = bytearray(secret, 'utf8')
    data = bytearray(data, 'utf8')
    return hmac.new(secret, data, digestmod=hashlib.sha256).digest()


def base64_of_hmac(data):
    return base64.b64encode(data)


def get_request_uuid():
    return str(uuid.uuid1())


def get_sorted_str(data, method):
    """
    鉴权用的参数整理
    :param data: dict 需要整理的参数
    :return: str
    """
    sorted_data = sorted(data.items(), key=lambda item: item[0])
    str_list = map(lambda x_y: '%s=%s' % (x_y[0], x_y[1]), sorted_data)

    return '&'.join(str_list)


def build_sign(query_params, body_params, eop_date, request_uuid, method):
    """
    计算鉴权字段
    :param query_params: dict get请求中的参数
    :param body_params: dict post请求中的参数
    :param eop_date: str 请求时间，格式为：'%Y%m%dT%H%M%SZ'
    :return: str
    """
    body_str = ""
    if not file:
        body_str = json.dumps(body_params) if body_params else ''
    if method == METHOD_POST:
        if file:
            body_digest = hashlib.sha256(body_params).hexdigest()
        else:
            if isinstance(body_params, dict):
                body_digest = hashlib.sha256(json.dumps(body_params).encode('utf-8')).hexdigest()
            else:
                body_digest = hashlib.sha256(body_params.encode('utf-8')).hexdigest()
    else:
        body_digest = hashlib.sha256(body_str.encode('utf-8')).hexdigest()
    # 请求头中必要的两个参数
    header_str = 'ctyun-eop-request-id:%s\neop-date:%s\n' % (request_uuid, eop_date)
    # url中的参数，或get参数
    query_str = encodeQueryStr(get_sorted_str(query_params, method))
    signature_str = '%s\n%s\n%s' % (header_str, query_str, body_digest)
    print_log(repr('signature_str is: %s' % signature_str))
    sign_date = eop_date.split('T')[0]

    # 计算鉴权密钥
    k_time = hmac_sha256(sk, eop_date)
    k_ak = hmac_sha256(k_time, ak)
    k_date = hmac_sha256(k_ak, sign_date)

    signature_base64 = base64_of_hmac(hmac_sha256(k_date, signature_str))
    # 构建请求头的鉴权字段值
    sign_header = '%s Headers=ctyun-eop-request-id;eop-date Signature=%s' % (ak, signature_base64.decode('utf8'))
    print_log("sign_header             :" + sign_header)
    return sign_header.encode('utf8')


def get_sign_headers(query_params, body, method, content_type):
    """
    获取鉴权用的请求头参数
    :param query_params: dict get请求中的参数
    :param body: dict post请求中的参数
    :return:
    """
    now = datetime.datetime.now()
    eop_date = datetime.datetime.strftime(now, '%Y%m%dT%H%M%SZ')
    request_uuid = get_request_uuid()
    headers = {  # 三个鉴权用的参数
        'Content-type': content_type,
        'ctyun-eop-request-id': request_uuid,
        'Eop-Authorization': build_sign(query_params=query_params, body_params=body, eop_date=eop_date,
                                        request_uuid=request_uuid, method=method),
        'Eop-date': eop_date,
    }
    return headers


def get(url, query="", params=None, header_params=None):
    return execute(url, query, method=METHOD_GET, params=params, header_params=header_params)


def post(url, query="", params=None, header_params=None, content_type='application/json;charset=UTF-8'):
    return execute(url, query, method=METHOD_POST, params=params, header_params=header_params,
                   content_type=content_type)


def execute(url, query, method, params=None, header_params=None, content_type='application/json;charset=UTF-8'):
    if 'application/x-www-form-urlencoded' in content_type:
        if VERSION == '2':
            params = urllib.urlencode(params)
        else:
            params = urllib.parse.urlencode(params)
    params = params or {}
    header_params = header_params or {}
    if method == METHOD_GET:
        query_params, body = (params, {})
    else:
        query_params = {}
        if len(query) > 0:
            for q in query.split('&'):
                query_params[q.split("=")[0]] = q.split("=")[1]
        body = params
    headers = get_sign_headers(query_params, body, method, content_type)
    headers.update(header_params)
    headers.update(
        {"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/110.0"}
    )

    url = url + "?" + encodeQueryStr(query)
    print_log('url: %s' % url)
    print_log('请求方式: %s' % method)
    print_log('请求头:\n %s' % headers)
    print_log('请求参数:\n %s' % params)
    print_log('请求参数类型:\n %s' % type(params))
    requests.packages.urllib3.disable_warnings()
    if method == METHOD_GET:
        res = requests.get(url, params=params, headers=headers, verify=False)
    else:
        if 'application/x-www-form-urlencoded' in content_type:
            res = requests.post(url, data=params, headers=headers, verify=False)
        elif 'multipart/form-data' in content_type:
            res = requests.post(url, data=params, headers=headers, verify=False)
        else:
            res = requests.post(url, json=params, headers=headers, verify=False)

    print_log('返回状态码: %s' % res.status_code)
    print_log('返回: %s' % res.json())
    return res


def print_log(log_info):
    return
    now = datetime.datetime.now()
    log_info = '[%s]: %s' % (str(now), log_info)
    print(log_info)


def encodeQueryStr(query):
    afterQuery = ""
    if (len(query) != 0):
        param = query.split("&")
        param.sort()
        for str in param:
            if (len(afterQuery) < 1):
                s = str.split("=")
                if (len(s) <= 2):
                    encodeStr = quote(s[1])
                    str = s[0] + "=" + encodeStr
                    afterQuery = afterQuery + str
                else:
                    encodeStr = ""
                    str = s[0] + "=" + encodeStr
                    afterQuery = afterQuery + str
            else:
                s = str.split("=")
                if (len(s) >= 2):
                    encodeStr = quote(s[1])
                    str = s[0] + "=" + encodeStr
                    afterQuery = afterQuery + "&" + str
                else:
                    encodeStr = ""
                    str = s[0] + "=" + encodeStr
                    afterQuery = afterQuery + "&" + str

    return afterQuery

def generate_body(file_list, boundary, params):
    lastbody = bytearray()
    for file in file_list:
        file_name_key = list(file.keys())[0]
        file_path = list(file.values())[0]
        file_name = os.path.basename(file_path)
        body1_array = bytearray(
            '--' + boundary + "\r\n" + "Content-Disposition: form-data; name=\"" + file_name_key + "\"; filename=\"" + file_name + "\r\n" + "Content-Type: application/octet-stream" + "\r\n" + "\r\n",
            'utf8')
        if os.path.exists(file_path):
            with open(file_path, 'rb') as f:
                body2_array = bytearray(f.read())
        body3_array = bytearray("\r\n", 'utf8')
        lastbody.extend(body1_array)
        lastbody.extend(body2_array)
        lastbody.extend(body3_array)

    for param in params:
        body1_array = bytearray(
            '--' + boundary + "\r\n" + "Content-Disposition: form-data; name=\"" + list(param.keys())[
                0] + "\r\n" + "\r\n" + list(param.values())[0] + "\r\n", 'utf8')
        body3_array = bytearray("\r\n")
        lastbody.extend(body1_array)
        lastbody.extend(body3_array)
    body4_array = bytearray('--' + boundary + "--\r\n", 'utf8')
    lastbody.extend(body4_array)
    return lastbody

list_regions_resp = get("ctecs-global.ctapi.ctyun.cn/v4/region/list-regions")
list_regions_resp_json = json.loads(list_regions_resp.text)
region_info_array = list_regions_resp_json['returnObj']['regionList']

for region_info in region_info_array:
    params = {
        "regionID": region_info["regionID"]
    }
    region_summary_resp = get("ctecs-global.ctapi.ctyun.cn/v4/region/get-summary", params=params)
    region_summary = json.loads(region_summary_resp.text)['returnObj']
    print("%s,%s,%s,%s" % (region_info['regionName'], region_summary['regionVersion'], region_summary['isMultiZones'], region_summary['openapiAvailable']))

使用这一版代码，可以获取到如下的细节信息：

从这个结果我们可以分析出，天翼云的Region其实有不同的版本，分v3.0和v4.0，所有的v4.0的Region都支持多可用区，虽然比如南昌5只有一个可用区，但它是支持多可用区的，版本是v4.0。

另外，所有的v4.0版本Region都支持OpenAPI，但不是所有的v3.0 Region都支持OpenAPI。

感兴趣的同学可以使用上面的Python示例代码，去试试调用下其他的OpenAPI接口，肯定会有更多发现哟。