在Python中，我们需要从一个字符串中提取ID号 "12079500908"。字符串的格式如下：
view_doc_response = '{"total_count":1,"entries":[{"type":"file","id":"12079500908","sequence_id":"1","etag":"1","sha1":"6887169228cab0cfb341059194bc980e1be8ad90","name":"file.pdf","description":"","size":897838,"path_collection":{"total_count":2,"entries":[{"type":"folder","id":"0","sequence_id":null,"etag":null,"name":"All Files"},{"type":"folder","id":"1352745576","sequence_id":"0","etag":"0","name":"Patient Files"}]},"created_at":"2013-12-03T10:23:30-08:00","modified_at":"2013-12-03T11:17:52-08:00","trashed_at":null,"purged_at":null,"content_created_at":"2013-12-03T10:23:30-08:00","content_modified_at":"2013-12-03T11:17:52-08:00","created_by":{"type":"user","id":"20672372","name":"name","login":"email"},"modified_by":{"type":"user","id":"206732372","name":"name","login":"email"},"owned_by":{"type":"user","id":"206737772","name":"name","login":"email"},"shared_link":{"url":"https:\/\/www.box.net\/s\/ymfslf1phfqiw65bunjg","download_url":"https:\/\/www.box.net\/shared\/static\/ymfslf1phfqiw65bunjg.pdf","vanity_url":null,"is_password_enabled":false,"unshared_at":null,"download_count":0,"preview_count":0,"access":"open","permissions":{"can_download":true,"can_preview":true}},"parent":{"type":"folder","id":"1352745576","sequence_id":"0","etag":"0","name":"Patient Files"},"item_status":"active"}],"limit":30,"offset":0}'
使用 ast.literal_eval 方法来提取ID号时，发现了一个错误：ValueError: malformed string。这表明，ast.literal_eval 方法无法解析JSON格式的字符串。
2、解决方案 为了解决这个问题，我们可以使用 json.loads 方法来解析JSON格式的字符串，然后就可以轻松地提取ID号了。json.loads 方法的代码示例如下：
import json
json_str = '{"total_count":1,"entries":[{"type":"file","id":"12079500908","sequence_id":"1","etag":"1","sha1":"6887169228cab0cfb341059194bc980e1be8ad90","name":"file.pdf","description":"","size":897838,"path_collection":{"total_count":2,"entries":[{"type":"folder","id":"0","sequence_id":null,"etag":null,"name":"All Files"},{"type":"folder","id":"1352745576","sequence_id":"0","etag":"0","name":"Patient Files"}]},"created_at":"2013-12-03T10:23:30-08:00","modified_at":"2013-12-03T11:17:52-08:00","trashed_at":null,"purged_at":null,"content_created_at":"2013-12-03T10:23:30-08:00","content_modified_at":"2013-12-03T11:17:52-08:00","created_by":{"type":"user","id":"20672372","name":"name","login":"email"},"modified_by":{"type":"user","id":"206732372","name":"name","login":"email"},"owned_by":{"type":"user","id":"206737772","name":"name","login":"email"},"shared_link":{"url":"https:\/\/www.box.net\/s\/ymfslf1phfqiw65bunjg","download_url":"https:\/\/www.box.net\/shared\/static\/ymfslf1phfqiw65bunjg.pdf","vanity_url":null,"is_password_enabled":false,"unshared_at":null,"download_count":0,"preview_count":0,"access":"open","permissions":{"can_download":true,"can_preview":true}},"parent":{"type":"folder","id":"1352745576","sequence_id":"0","etag":"0","name":"Patient Files"},"item_status":"active"}],"limit":30,"offset":0}'
json_data = json.loads(json_str)
id = json_data['entries'][0]['id']
print(id)
运行这段代码，就可以输出ID号 "12079500908" 了。
