<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def show_tab_file(self, courseid, taskid, error=None):
 """ Return the file tab """

        return self.template_helper.get_renderer(False).course_admin.edit_tabs.files(
            self.course_factory.get_course(courseid), taskid, self.get_task_filelist(self.task_factory, courseid, taskid), error)