docs: def confirm_email(self, username, confirmation_key):
          """
          Confirm an email address by checking a ``confirmation_key``.
  
          A valid ``confirmation_key`` will set the newly wanted email address
          as the current email address. Returns the user after success or
          ``False`` when the confirmation key is invalid.
  
          :param confirmation_key:
              String containing the secret SHA1 that is used for verification.
  
          :return:
              The verified :class:`User` or ``False`` if not successful.
  
          """
          if SHA1_RE.search(confirmation_key):
              try:
                  user = self.select_related().get(username=username,
                                      email_confirmation_key=confirmation_key,
                                      email_unconfirmed__isnull=False)
              except self.model.DoesNotExist:
                  return False
              else:
                  user.email = user.email_unconfirmed
                  user.email_unconfirmed, user.email_confirmation_key = '',''
                  user.save(using=self._db)
                  # Send the confirmation_complete signal
                  accounts_signals.confirmation_complete.send(sender=None, 
                      user=user)
                  return user
          return False