test_resample.py 文件源码

def test_basic_downsample(self):
        ts = _simple_pts('1/1/1990', '6/30/1995', freq='M')
        result = ts.resample('a-dec').mean()

        expected = ts.groupby(ts.index.year).mean()
        expected.index = period_range('1/1/1990', '6/30/1995', freq='a-dec')
        assert_series_equal(result, expected)

        # this is ok
        assert_series_equal(ts.resample('a-dec').mean(), result)
        assert_series_equal(ts.resample('a').mean(), result)