Python-无法使用Google Drive API从Google Drive下载文件

起初,我遵循 quickstart sample (效果很好)然后移到 download files sample

from __future__ import print_function
from apiclient import discovery
from googleapiclient.discovery import build
from httplib2 import Http
from oauth2client import file, client, tools
import io
# from oauth2client import client
# from oauth2client import tools

SCOPES = 'https://www.googleapis.com/auth/drive.metadata.readonly'

def main():


    store = file.Storage('token.json')
    creds = store.get()
    if not creds or creds.invalid:
        flow = client.flow_from_clientsecrets('credentials.json', SCOPES)
        creds = tools.run_flow(flow, store)
    service = build('drive', 'v3', http=creds.authorize(Http()))

    file_id = 'myfileID'
    request = drive_service.files().get_media(fileId=file_id)
    fh = io.BytesIO()
    downloader = MediaIoBaseDownload(fh, request)
    done = False
    while done is False:
        status, done = downloader.next_chunk()
        print "Download %d%%." % int(status.progress() * 100)


if __name__ == '__main__':
    main()

但它不起作用,Python无法识别 媒体基础下载

from __future__ import print_function
from apiclient import discovery
from googleapiclient.discovery import build
from httplib2 import Http
from oauth2client import file, client, tools
import io
# from oauth2client import client
# from oauth2client import tools

SCOPES = 'https://www.googleapis.com/auth/drive.metadata.readonly'

def main():


    store = file.Storage('token.json')
    creds = store.get()
    if not creds or creds.invalid:
        flow = client.flow_from_clientsecrets('credentials.json', SCOPES)
        creds = tools.run_flow(flow, store)
    service = build('drive', 'v3', http=creds.authorize(Http()))

    file_id = 'myfileID'
    request = service.files().get_media(fileId=file_id)

    fh = io.BytesIO()
    with open('mydestinationFile', 'wb') as f:
        f.write(request)

    done = False
    while done is False:
        status, done = downloader.next_chunk()
        print("Download %d%%." % int(status.progress() * 100))


if __name__ == '__main__':
    main()

现在得到错误:

Traceback (most recent call last):
  File "Google API.py", line 50, in <module>
    main()
  File "Google API.py", line 32, in main
    f.write(request)
TypeError: a bytes-like object is required, not 'HttpRequest'

我在谷歌上搜索过,甚至在这里搜索过,但没有找到任何类似的东西。我知道我做错了什么,但不知道到底是什么。