Ошибка API Google - файл учетных данных не существует

Question

У меня возникают трудности при попытке подключиться к API Google Drive с помощью кода, приведенного в документации API. Я хотел бы прочитать файлы на моем диске Google.

Это код, который я использую

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
# If modifying these scopes, delete the file token.pickle.
SCOPES = ['https://www.googleapis.com/auth/drive.metadata.readonly']
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(
                'credentials.json', SCOPES)
            creds = flow.run_local_server()
        # 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()

Файл учетных данных находится в моем рабочем каталоге:

import os
path = os.path.abspath('credentials.json')
path
#path#
'/Users/emmanuelmac/credentials.json'

Прочитал Google Drive API, не уверен, что я делаю не так

Это мой след:

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-26-053e36207d0e> in <module>()
     46 
     47 if __name__ == '__main__':
---> 48     main()

<ipython-input-26-053e36207d0e> in main()
     25         else:
     26             flow = InstalledAppFlow.from_client_secrets_file(
---> 27                 'credentials.json', SCOPES)
     28             creds = flow.run_local_server()
     29         # Save the credentials for the next run

~/anaconda3/lib/python3.6/site-packages/google_auth_oauthlib/flow.py in from_client_secrets_file(cls, client_secrets_file, scopes, **kwargs)
    169             Flow: The constructed Flow instance.
    170         """
--> 171         with open(client_secrets_file, 'r') as json_file:
    172             client_config = json.load(json_file)
    173 

FileNotFoundError: [Errno 2] No such file or directory: 'credentials.json'