test_common.py 文件源码

def test_isnull_datetime():
    assert (not isnull(datetime.now()))
    assert notnull(datetime.now())

    idx = date_range('1/1/1990', periods=20)
    assert (notnull(idx).all())

    idx = np.asarray(idx)
    idx[0] = iNaT
    idx = DatetimeIndex(idx)
    mask = isnull(idx)
    assert (mask[0])
    assert (not mask[1:].any())

    # GH 9129
    pidx = idx.to_period(freq='M')
    mask = isnull(pidx)
    assert (mask[0])
    assert (not mask[1:].any())

    mask = isnull(pidx[1:])
    assert (not mask.any())