NameError：名称'service'未定义Google API

Question

我想将照片上传到Google云端硬盘。我可以读取驱动器上的文件。但是，当我在广告上传部分时，我总是遇到同样的错误。我一直收到错误消息“ NameError：未定义名称'service'”，我导入了每个库，但仍然无法正常工作。这是我浏览的代码，但没有看到解释它的文章。

from __future__ import print_function
import pickle
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from apiclient.http import MediaFileUpload


# If modifying these scopes, delete the file token.pickle.
SCOPES = ['https://www.googleapis.com/auth/drive']

def main():
"""Shows basic usage of the Drive v3 API.
Prints the names and ids of the first 10 files the user has access to.
"""
creds = None
# The file token.pickle stores the user's access and refresh tokens, and is
# created automatically when the authorization flow completes for the first
# time.
if os.path.exists('token.pickle'):
    with open('token.pickle', 'rb') as token:
        creds = pickle.load(token)
# If there are no (valid) credentials available, let the user log in.
if not creds or not creds.valid:
    if creds and creds.expired and creds.refresh_token:
        creds.refresh(Request())
    else:
        flow = InstalledAppFlow.from_client_secrets_file(
            'client_secret.json', SCOPES)
        creds = flow.run_local_server(port=0)
    # Save the credentials for the next run
    with open('token.pickle', 'wb') as token:
        pickle.dump(creds, token)

service = build('drive', 'v3', credentials=creds)


# Call the Drive v3 API
results = service.files().list(
    pageSize=10, 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(u'{0} ({1})'.format(item['name'], item['id']))

if __name__ == '__main__':
main()

file_metadata = {'name': 'unnamed.jpg'}
media = MediaFileUpload('unnamed.jpg',
                    mimetype='image/jpeg')
file = service.files().create(body=file_metadata,
                                media_body=media,
                                fields='id').execute()
print ('File ID: %s' % file.get('id'))

Answer 1

您的代码格式不清楚，但是我希望您的问题是service在main函数中定义为service = build('drive', 'v3', credentials=creds)。但是，然后尝试在if __name__ == "__main__"块中的函数之外使用它。由于该变量在此范围内不存在，因此将不起作用。

您要么需要在此作用域中，在行之前重新定义service，>

file = service.files().create(body=file_metadata,
                                media_body=media,
                                fields='id').execute()
或者您可以通过main函数返回服务并使用service = main()。