Delete account from DB

def delete_account(self, data):
        """ Delete account from DB """
        error = False
        msg = ""

        username = self.user_manager.session_username()

        # Check input format
        result = self.database.users.find_one_and_delete({"username": username,
                                                          "email": data.get("delete_email", "")})
        if not result:
            error = True
            msg = _("The specified email is incorrect.")
        else:
            self.database.submissions.remove({"username": username})
            self.database.user_tasks.remove({"username": username})

            all_courses = self.course_factory.get_all_courses()

            for courseid, course in all_courses.items():
                if self.user_manager.course_is_open_to_user(course, username):
                    self.user_manager.course_unregister_user(course, username)

            self.user_manager.disconnect_user()
            raise web.seeother("/index")

        return msg, error