如何通过 API 使用 For Loop 从 Google Drive 下载文件答案

【问题标题】：How to download files from Google Drive using For Loop through API如何通过 API 使用 For Loop 从 Google Drive 下载文件
【发布时间】：2019-11-01 21:09:26
【问题描述】：

当我通过 api 在 Google Drive 上检索 csv 文件时，我得到的文件没有内容。
下面的代码由3部分组成（1：认证2：搜索文件，3：下载文件）。
我怀疑 step3: download files 有问题，特别是在 while done is False 附近，因为我在访问 Google Drive 和下载文件时没有问题。只是它们都是空文件。

如果有人可以告诉我如何解决它，那就太好了。下面的代码大多是从谷歌网站借来的。提前感谢您的宝贵时间！

第 1 步：身份验证

from apiclient import discovery
from httplib2 import Http
import oauth2client
from oauth2client import file, client, tools
obj = lambda: None # this code allows for an empty class
auth = {"auth_host_name":'localhost', 'noauth_local_webserver':'store_true', 'auth_host_port':[8080, 8090], 'logging_level':'ERROR'}
for k, v in auth.items():
    setattr(obj, k, v)

scopes = 'https://www.googleapis.com/auth/drive'
store = file.Storage('token_google_drive2.json')
creds = store.get()
# The following will takes a user to authentication link if no token file is found.
if not creds or creds.invalid:
    flow = client.flow_from_clientsecrets('client_id.json', scopes)
    creds = tools.run_flow(flow, store, obj)

第 2 步：搜索文件并创建要下载的文件字典

from googleapiclient.discovery import build

page_token = None
drive_service = build('drive', 'v3', credentials=creds)
while True:
    name_list = []
    id_list = []
    response = drive_service.files().list(q="mimeType='text/csv' and name contains 'RR' and name contains '20191001'", spaces='drive',fields='nextPageToken, files(id, name)', pageToken=page_token).execute()
    for file in response.get('files', []):
        name = file.get('name')
        id_ = file.get('id')

        #name and id are strings, so create list first before creating a dictionary
        name_list.append(name)
        id_list.append(id_)


        #also you need to remove ":" in name_list or you cannot download files - nowhere to be found in the folder!
        name_list = [word.replace(':','') for word in name_list]
    page_token = response.get('nextPageToken', None)
    if page_token is None:
        break

#### Create dictionary using name_list and id_list
zipobj = zip(name_list, id_list)
temp_dic = dict(zipobj)

第 3 步：下载文件（麻烦的部分）

import io
from googleapiclient.http import MediaIoBaseDownload

for i in range(len(temp_dic.values())):
    file_id = list(temp_dic.values())[i]
    v = list(temp_dic.keys())[i]
    request = drive_service.files().get_media(fileId=file_id)
    fh = io.FileIO(v, mode='w')
    downloader = MediaIoBaseDownload(fh, request)
    done = False
while done is False:
    status, done = downloader.next_chunk()
    status_complete = int(status.progress()*100)
    print(f'Download of {len(temp_dic.values())} files, {int(status.progress()*100)}%')

【问题讨论】：

标签： python for-loop file-io google-drive-api google-analytics-api

【解决方案1】：

其实我自己想通了。下面是一个编辑。我需要做的就是删除done = False while done is False: 并添加fh.close() 以关闭下载器。

完整修改的第三部分如下：

from googleapiclient.http import MediaIoBaseDownload

for i in range(len(temp_dic.values())):

    file_id = list(temp_dic.values())[i]
    v = list(temp_dic.keys())[i]
    request = drive_service.files().get_media(fileId=file_id)

    # replace the filename and extension in the first field below
    fh = io.FileIO(v, mode='wb') #only in Windows, writing for binary is specified with wb
    downloader = MediaIoBaseDownload(fh, request)

    status, done = downloader.next_chunk()
    status_complete = int(status.progress()*100)
    print(f'{list(temp_dic.keys())[i]} is {int(status.progress()*100)}% downloaded')

fh.close()
print(f'{len(list(temp_dic.keys()))} files')

【讨论】：