human
Give me a the Python program you requested given the following:
Complete the below
def _attempt_YYYYMMDD(arg, errors):

    ''''try to parse the YYYYMMDD/%Y%m%d format, try to deal with NaT-like,
    arg is a passed in as an object dtype, but could really be ints/strings
    with nan-like/or floats (e.g. with nan)
    Parameters
    arg : passed value
    errors : \'raise\',\'ignore\',\'coerce\''
    '''
assistant
#Here is the Python program you requested.
    def calc(carg):
        carg = carg.astype(object)
        parsed = lib.try_parse_year_month_day((carg / 10000), ((carg / 100) % 100), (carg % 100))
        return tslib.array_to_datetime(parsed, errors=errors)
    def calc_with_mask(carg, mask):
        result = np.empty(carg.shape, dtype='M8[ns]')
        iresult = result.view('i8')
        iresult[(~ mask)] = tslib.iNaT
        result[mask] = calc(carg[mask].astype(np.float64).astype(np.int64)).astype('M8[ns]')
        return result
    try:
        return calc(arg.astype(np.int64))
    except:
        pass
    try:
        carg = arg.astype(np.float64)
        return calc_with_mask(carg, notna(carg))
    except:
        pass
    try:
        mask = (~ algorithms.isin(arg, list(tslib._nat_strings)))
        return calc_with_mask(arg, mask)
    except:
        pass
    return None