code: def _check_email_match(self, user, email):
          
          if user.email != email:
              # The passed email address doesn't match this username's email address.
              # Assume a problem and fail.
              raise CommandError(
                  _(
                      'Skipping user "{}" because the specified and existing email '
                      'addresses do not match.'
                  ).format(user.username)
              )
docs: DRY helper.
  
          Requiring the user to specify both username and email will help catch
          certain issues, for example if the expected username has already been
          taken by someone else.