我知道这是一个老问题，但我终于找到了适合我的东西。在使用allauth成功进行身份验证之后，我这样做是为了获得客户端令牌，然后构建服务。

from googleapiclient.discovery import build
    from google.oauth2.credentials import Credentials
    from allauth.socialaccount.models import SocialToken, SocialApp

    ...    

    # request is the HttpRequest object
    token = SocialToken.objects.get(account__user=request.user, account__provider='google')

    credentials = Credentials(
        token=token.token,
        refresh_token=token.token_secret,
        token_uri='https://oauth2.googleapis.com/token',
        client_id='client-id', # replace with yours 
        client_secret='client-secret') # replace with yours 

    service = build('calendar', 'v3', credentials=credentials)

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确保SOCIALACCOUNT_STORE_TOKENS = True与https://django-allauth.readthedocs.io/en/latest/configuration.html一样，否则您将不会有任何SocialToken对象。