test_period.py 文件源码

def test_period_cons_nat(self):
        p = Period('NaT', freq='M')
        self.assertEqual(p.ordinal, tslib.iNaT)
        self.assertEqual(p.freq, 'M')
        self.assertEqual((p + 1).ordinal, tslib.iNaT)

        p = Period('nat', freq='W-SUN')
        self.assertEqual(p.ordinal, tslib.iNaT)
        self.assertEqual(p.freq, 'W-SUN')
        self.assertEqual((p + 1).ordinal, tslib.iNaT)

        p = Period(tslib.iNaT, freq='D')
        self.assertEqual(p.ordinal, tslib.iNaT)
        self.assertEqual(p.freq, 'D')
        self.assertEqual((p + 1).ordinal, tslib.iNaT)

        p = Period(tslib.iNaT, freq='3D')
        self.assertEqual(p.ordinal, tslib.iNaT)
        self.assertEqual(p.freq, offsets.Day(3))
        self.assertEqual(p.freqstr, '3D')
        self.assertEqual((p + 1).ordinal, tslib.iNaT)

        self.assertRaises(ValueError, Period, 'NaT')