问如何在注册过程中获得多个google凭据(Gmail API、Pub/Sub、Contacts)

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SCOPES = 'https://www.googleapis.com/auth/gmail.modify'
CLIENT_SECRET_FILE = "client_secret_pubsub.json"
APPLICATION_NAME = "pub-sub-project-te"

def get_credentials():
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,
                               'gmail-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
    print('Storing credentials to ' + credential_path)
return credentials


def pull_emails_from_mailbox(credentials_obj):

credentials = get_credentials()

http = credentials.authorize(Http())

GMAIL=discovery.build('gmail', 'v1', http=http)

user_id =  'me'
label_id_one = 'INBOX'
label_id_two = 'UNREAD'

# Getting all the unread messages from Inbox
# labelIds can be changed accordingly
messages = GMAIL.users().messages().list(userId=user_id, maxResults=1000).execute()
#unread_msgs = GMAIL.users().messages().list(userId='me',labelIds=[label_id_one,label_id_two]).execute()

# We get a dictonary. Now reading values for the key 'messages'

mssg_list = messages['messages']

print ("Total messages in inbox: ", str(len(mssg_list)))

final_list = []

new_messages=[]
for mssg in mssg_list:
    m_id = mssg['id'] # get id of individual message
    new_messages.append(GMAIL.users().messages().get(userId=user_id, id=m_id).execute()) # fetch the message using API

return new_messages


def prepare_raw_db (raw_messages):

messageId=[]
historyId=[]
raw=[]

print ("Total number of emails to be parsed:", len(raw_messages))

for msg in raw_messages:
    messageId.append(msg["id"])
    historyId.append(msg['historyId'])
    raw.append(msg)

        #'addLabelIds': ['UNREAD']
    GMAIL.users().messages().modify(userId="me", id=msg["id"],body={ 'removeLabelIds': ['UNREAD'] }).execute() 

msg_dict={"messageId":messageId, "historyId":historyId, "raw":raw}

df=pd.DataFrame(msg_dict)

df.raw=df.raw.astype(str)

return df