<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _delete_dir(dir):
 """ Delete a directory. """

    try:
        shutil.rmtree(dir)  # delete directory
    except OSError as exc:
        if exc.errno != 2:  # code 2 - no such file or directory
            raise  # re-raise exception
    except UnboundLocalError:
        pass