old_contents: from django.utils.translation import ugettext
  from social_auth.exceptions import AuthAlreadyAssociated
  from social_auth.backends.pipeline.associate import associate_by_email as super_associate_by_email
  
  
  def associate_by_email(*args, **kwargs):
      """Check if a user with this email already exists. If they do, don't create an account."""
      backend = kwargs['backend']
      if backend.name == 'google-oauth2':
          # We provide and exception here for users upgrading.
          return super_associate_by_email(*args, **kwargs)
  
      msg = ugettext('This email is already in use. First login with your other account and '
                     'under the top right menu click add account.')
      raise AuthAlreadyAssociated(backend, msg % {
          'provider': backend.name
      })
  
new_contents: from django.contrib.auth import get_user_model
  from django.utils.translation import ugettext
  from social_auth.exceptions import AuthAlreadyAssociated
  from social_auth.backends.pipeline.associate import associate_by_email as super_associate_by_email
  
  
  def associate_by_email(*args, **kwargs):
      """Check if a user with this email already exists. If they do, don't create an account."""
      backend = kwargs['backend']
      if backend.name in ['google-oauth2', 'github']:
          # We provide and exception here for users upgrading.
          return super_associate_by_email(*args, **kwargs)
  
      email = kwargs['details'].get('email')
  
      if email:
          User = get_user_model()
          if User.objects.filter(email=email).exists():
              msg = ugettext('This email is already in use. First login with your other account and '
                             'under the top right menu click add account.')
              raise AuthAlreadyAssociated(backend, msg % {
                  'provider': backend.name
              })
  
subject: Fix false positive for the social login