test_base.py 文件源码

def test_constructor_from_series(self):

        expected = DatetimeIndex([Timestamp('20110101'), Timestamp('20120101'),
                                  Timestamp('20130101')])
        s = Series([Timestamp('20110101'), Timestamp('20120101'), Timestamp(
            '20130101')])
        result = Index(s)
        self.assertTrue(result.equals(expected))
        result = DatetimeIndex(s)
        self.assertTrue(result.equals(expected))

        # GH 6273
        # create from a series, passing a freq
        s = Series(pd.to_datetime(['1-1-1990', '2-1-1990', '3-1-1990',
                                   '4-1-1990', '5-1-1990']))
        result = DatetimeIndex(s, freq='MS')
        expected = DatetimeIndex(
            ['1-1-1990', '2-1-1990', '3-1-1990', '4-1-1990', '5-1-1990'
             ], freq='MS')
        self.assertTrue(result.equals(expected))

        df = pd.DataFrame(np.random.rand(5, 3))
        df['date'] = ['1-1-1990', '2-1-1990', '3-1-1990', '4-1-1990',
                      '5-1-1990']
        result = DatetimeIndex(df['date'], freq='MS')
        self.assertTrue(result.equals(expected))
        self.assertEqual(df['date'].dtype, object)

        exp = pd.Series(
            ['1-1-1990', '2-1-1990', '3-1-1990', '4-1-1990', '5-1-1990'
             ], name='date')
        self.assert_series_equal(df['date'], exp)

        # GH 6274
        # infer freq of same
        result = pd.infer_freq(df['date'])
        self.assertEqual(result, 'MS')