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