Python Series.null_count示例

示例#1

文件： test_series.py 项目： stjordanis/polars

def test_to_python():
    a = Series("a", range(20))
    b = a.to_list()
    assert isinstance(b, list)
    assert len(b) == 20

    a = Series("a", [1, None, 2], nullable=True)
    assert a.null_count() == 1
    assert a.to_list() == [1, None, 2]

示例#2

文件： test_testing.py 项目： pola-rs/polars

def test_strategy_null_probability(
    s: pl.Series,
    df1: pl.DataFrame,
    df2: pl.DataFrame,
    df3: pl.DataFrame,
) -> None:
    for obj in (s, df1, df2, df3):
        assert len(obj) == 50  # type: ignore[arg-type]

    assert s.null_count() < df1.null_count().fold(sum).sum()
    assert df1.null_count().fold(sum).sum() < df2.null_count().fold(sum).sum()
    assert df2.null_count().fold(sum).sum() < df3.null_count().fold(sum).sum()

    nulls_col0, nulls_col1 = df2.null_count().rows()[0]
    assert nulls_col0 > nulls_col1
    assert nulls_col0 < 50

    nulls_col0, nulls_colx = df3.null_count().rows()[0]
    assert nulls_col0 > nulls_colx
    assert nulls_col0 == 50