尝试循环 API 调用直到满足条件

Posted 2023-03-15

【中文标题】尝试循环 API 调用直到满足条件

【英文标题】：Trying to loop an API call until condition is met

【发布时间】：2022-01-20 20:40:06

【问题描述】：

背景 - 我正在尝试创建一个在条件为真时继续调用 API（响应 = api_response）的函数。当条件为 False 时，函数应改为返回 api_response。

功能 - 这是我当前形式的功能。我自己完全糊涂了，所以写了一些笔记，所以你可以“尝试”并理解我的思维过程：

def api_call():
#   Getting required variables by calling other functions
    key, secret, url = ini_reader()
    endpoint_url = endpoint_initializer()
    
#   In these 3x lines of code I'm trying to ensure the API is called.
    while True:
        response = requests.get(url = endpoint_url, auth = HTTPBasicAuth(key, secret), headers = "My-firm": "482")
        api_response = json.loads(response.text)

#       I am now trying to take the returned 'api_response' and see if a condition is met / trying extract certain key pair values,
#       which tell me the data isn't available. If the condition is met (keys are in the response / data isn't available), I am expecting
#       the API to continue being called again and the loop continues to iterate until the condition is not met, at which point I am expecting to simply have 'api_response' returned.  
    try:
            id_value = "id"
            res1 = [val[id_value] for key, val in api_response.items() if id_value in val]
            id_value = "".join(res1)
            percent_value = "percent_complete"
            res2 = (tuple(api_response["data"]["attributes"].get("percent_complete", '') for key, val in api_response.items()))
            print(f' Your data requested, associated with ID: id_value is res2 complete!')
            time.sleep(5)
#       If the above condition isn't met, then return 'api_response', which includes the data.
        except:
            return api_response
api_call()

问题 - 目前，我似乎无法让我的循环正常运行，因为它调用 API 一次然后死掉。任何人都可以让我正确，并实施正确的循环吗？

【问题讨论】：

你为什么使用try / except？ try 子句中的语句永远不会失败

你启发我重新审视这个问题，并很快解决。谢谢@gimix

【参考方案1】：

感谢有用的用户评论，我发现 try 语句没有测试任何东西，会无限循环，相反，我使用 while True 启动无限循环，并在使用 @ 之前捕获 API 响应987654323@ 语句来测试条件 (if "meta not in api_response)。如果该条件为真，则循环将继续调用 API 获取数据并从 API 打印一条消息（获取诸如 percent_complete 之类的数据）并向用户打印一条有关 API 响应进度的消息。

最后一次elif "meta in api_response:（表示API响应现在正在返回数据），然后我return api_respone，准备被另一个函数使用。

功能齐全 -

def api_call():

    key, secret, url = ini_reader()
    endpoint_url = endpoint_initializer()
    
    date = dt.datetime.today().strftime("%Y-%m-%d")
    print("-------------------------------------\n","API URL constructed for:", date, "\n-------------------------------------")
    print("-------------------------------------------------------------\n","Endpoint:", endpoint_url, "\n-------------------------------------------------------------")

    while True:
        response = requests.get(url = endpoint_url, auth = HTTPBasicAuth(key, secret), headers = "Vendor-firm": "443")
        api_response = json.loads(response.text)
        if "meta" not in api_response:
            id_value = "id"
            res1 = [val[id_value] for key, val in api_response.items() if id_value in val]
            id_value = "".join(res1)
            percent_value = "percent_complete"
            res2 = (tuple(api_response["data"]["attributes"].get("percent_complete", '') for key, val in api_response.items()))
            print(f' Your data requested, associated with ID: id_value is res2 complete!')
            time.sleep(5)
        elif "meta" in api_response:
            return api_response
api_call()