python - 从请求到多事件 api 获取空数组

Question

我正在尝试使用多事件 api 来获取有关两个日期之间的音乐事件(音乐会)的信息。例如，我想获取 20171012 到 20171013 期间每场音乐会的以下信息:

- city
- performer
- country
- latitude
- longitude
- genre
- title
- image
- StarTime

我使用在线提供的 python 示例并对其进行更改以获取上述数据。但是现在它不起作用我只能得到这些信息:

 {'latitude': '40.4', 
  'longitude': '-3.68333', 
  'start_time': '2017-10-12 20:00:00', 
  'city_name': 'Madrid', 'title': 'Kim Waters & Maysa Smooth en Hot Jazz Festival'}

但表演者、流派国家和图片网址无效。你知道如何获得这些信息吗？当我更改下面的 python 示例以获取此信息时，它始终返回一个空数组。

python 示例工作:(但是，如果我将这些元素添加到 event_features，我会得到一个空数组，但没有获得表演者、流派、国家和图像 url)

   import requests
   import datetime

def get_event(user_key, event_location , start_date, end_date, event_features, fname):

    data_lst = []  # output
    start_year = int(start_date[0:4])
    start_month = int(start_date[4:6])
    start_day = int(start_date[6:])

    end_year = int(end_date[0:4])
    end_month = int(end_date[4:6])
    end_day = int(end_date[6:])

    start_date = datetime.date(start_year, start_month, start_day)
    end_date = datetime.date(end_year, end_month, end_day)
    step = datetime.timedelta(days=1)

    while start_date <= end_date:

        date = str(start_date.year)
        if start_date.month < 10:
            date += '0' + str(start_date.month)
        else:
            date += str(start_date.month)

        if start_date.day < 10:
            date += '0' + str(start_date.day)
        else:
            date += str(start_date.day)
        date += "00"
        date += "-" + date

        url = "http://api.eventful.com/json/events/search?"
        url += "&app_key=" + user_key
        url += "&location=" + event_location
        url += "&date=" + date
        url += "&page_size=250"
        url += "&sort_order=popularity"
        url += "&sort_direction=descending"
        url += "&q=music"
        url+= "&c=music"

        data = requests.get(url).json()

        try:
            for i in range(len(data["events"]["event"])):
                data_dict = {}
                for feature in event_features:
                    data_dict[feature] = data["events"]["event"][i][feature]
                data_lst.append(data_dict)
        except:
            pass

        print(data_lst)
        start_date += step


def main():

    user_key = ""
    event_location = "Madrid"
    start_date = "20171012"
    end_date = "20171013"
    event_location = event_location.replace("-", " ")
    start_date = start_date
    end_date = end_date
    event_features = ["latitude", "longitude", "start_time"]
    event_features += ["city_name", "title"]
    event_fname = "events.csv"

    get_event(user_key, event_location, start_date, end_date, event_features, event_fname)


if __name__ == '__main__':
    main()

Answer 1

您应该调试您的问题并且不要忽略所有异常。

替换行 try: ... except: pass by:

    data = requests.get(url).json()
    if "event" in data.get("event", {}):
        for row in data["events"]["event"]:
           # print(row)  # you can look here what are the available data, while debugging
           data_dict = {feature: row[feature] for feature in features}
           data_lst.append(data_dict)
    else:
        pass  # a problem - you can do something here

您将看到一个 KeyError，其中包含缺少的 feature 的名称，该名称在“行”中不存在。您应该修复缺失的功能并阅读有关该服务的 API 的文档。国家特征可能是类似于“city_name”的“country_name”。也许您应该设置“include”参数以在搜索中指定比默认值更多的详细信息部分。

---

一个通用的 try: ... except: pass 不应该被使用，因为“错误不应该悄悄地过去。” ( The Zen of Python )

阅读 Handling Exceptions :

... The last except clause may omit the exception name(s), to serve as a wildcard. Use this with extreme caution, since it is easy to mask a real programming error in this way! ...

一个更重要的可能会出现意外异常的命令是requests.get(url).json()，例如超时异常。无论如何，如果出现问题，您不应该继续“while”循环。