python - 仅本地理信息在 python 中可用时才运行

Question

这是代码片段:

import flickrapi

api_key = "xxxxxxxxxxxxxxxxxxxxx"
secret_api_key = "xxxxxxxxxx"
flickr = flickrapi.FlickrAPI(api_key, secret_api_key)

def obtainImages3():

    group_list = flickr.groups.search (api_key=api_key, text = 'Paris', per_page = 10)

    for group in group_list[0]:

        group_images = flickr.groups.pools.getPhotos (api_key=api_key, group_id = group.attrib['nsid'], extras = 'geo, tags, url_s')

        for image in group_images[0]:
        url = image.attrib['url_s']
        tags = image.attrib['tags']

        if image.attrib['geo'] != 'null':

            photo_location = flickr.photos_geo_getLocation(photo_id=image.attrib['id'])
            lat = float(photo_location[0][0].attrib['latitude'])
            lon = float(photo_location[0][0].attrib['longitude'])

当且仅当图像连接有地理标签时，我想获取有关图像的信息。我尝试使用 if image.attrib['geo'] != 'null' 行来执行此操作，但我认为这不起作用。任何人都可以建议我可以做到这一点的方法吗，提前致谢!

Answer 1

将 if image.attrib['geo']!='null' 条件替换为 try 和异常 block ，如下所示。由于 API 以 JSON 格式返回数据，您可以使用以下方法检查 key 是否存在:

try:
    image.attrib['geo']
    photo_location=flickr.photos_geo_getLocation(photo_id=image.attrib['id'])
    lat = float(photo_location[0][0].attrib['latitude'])
    lon = float(photo_location[0][0].attrib['longitude'])
except KeyError:
    pass