使用Google云端硬盘获取WebViewLinks

我刚刚开始尝试使用Google Drive API。使用快速入门指南设置身份验证，可以打印文件列表，甚至可以制作副本。一切正常，但是尝试从云端硬盘上的文件访问数据时遇到麻烦。特别是，我试图获取一个WebViewLink，但是当我打电话时，.get我只收到一个几乎没有文件元数据的小词典。该文档使所有数据看起来默认都应该存在，但是没有出现。我找不到任何方法来标记请求任何其他信息。

credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('drive', 'v3', http=http)

results = service.files().list(fields="nextPageToken, files(id, name)").execute()
items = results.get('files', [])
if not items:
    print('No files found.')
else:
    print('Files:')
    for item in items:
        print(item['name'], item['id'])
        if "Target File" in item['name']:
            d = service.files().get(fileId=item['id']).execute()
            print(repr(d))

这是上面代码的输出：（格式化是我的工作）

{u'mimeType': u'application/vnd.google-apps.document', 
 u'kind': u'drive#file',
 u'id': u'1VO9cC8mGM67onVYx3_2f-SYzLJPR4_LteQzILdWJgDE',
 u'name': u'Fix TVP Licence Issues'}

对于任何对代码感到困惑的人，都缺少一些东西，这些东西仅仅get_credentials是API快速入门页面中的基本功能以及一些常量和导入。为了完整起见，以下是我的代码中未经修改的所有内容：

from __future__ import print_function
import httplib2
import os

from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools

SCOPES = 'https://www.googleapis.com/auth/drive'
CLIENT_SECRET_FILE = 'client_secret.json'
APPLICATION_NAME = 'Drive API Python Quickstart'

try:
    import argparse
    flags = argparse.ArgumentParser(parents=[tools.argparser]).parse_args()
except ImportError:
    flags = None


def get_credentials():
    """Gets valid user credentials from storage.

    If nothing has been stored, or if the stored credentials are invalid,
    the OAuth2 flow is completed to obtain the new credentials.

    Returns:
        Credentials, the obtained credential.
    """
    home_dir = os.path.expanduser('~')
    credential_dir = os.path.join(home_dir, '.credentials')
    if not os.path.exists(credential_dir):
        os.makedirs(credential_dir)
    credential_path = os.path.join(credential_dir,
                                   'drive-python-quickstart.json')

    store = oauth2client.file.Storage(credential_path)
    credentials = store.get()
    if not credentials or credentials.invalid:
        flow = client.flow_from_clientsecrets(CLIENT_SECRET_FILE, SCOPES)
        flow.user_agent = APPLICATION_NAME
        if flags:
            credentials = tools.run_flow(flow, store, flags)
        else: # Needed only for compatibility with Python 2.6
            credentials = tools.run(flow, store)
        print('Storing credentials to ' + credential_path)
    return credentials

那么，缺少的是什么，我如何才能获得API以返回所有现在还没有出现的所有额外元数据呢？