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| import numpy as np
| import pytest
|
| import pandas as pd
| import pandas._testing as tm
|
|
| def test_basic():
| s = pd.Series([[0, 1, 2], np.nan, [], (3, 4)], index=list("abcd"), name="foo")
| result = s.explode()
| expected = pd.Series(
| [0, 1, 2, np.nan, np.nan, 3, 4], index=list("aaabcdd"), dtype=object, name="foo"
| )
| tm.assert_series_equal(result, expected)
|
|
| def test_mixed_type():
| s = pd.Series(
| [[0, 1, 2], np.nan, None, np.array([]), pd.Series(["a", "b"])], name="foo"
| )
| result = s.explode()
| expected = pd.Series(
| [0, 1, 2, np.nan, None, np.nan, "a", "b"],
| index=[0, 0, 0, 1, 2, 3, 4, 4],
| dtype=object,
| name="foo",
| )
| tm.assert_series_equal(result, expected)
|
|
| def test_empty():
| s = pd.Series(dtype=object)
| result = s.explode()
| expected = s.copy()
| tm.assert_series_equal(result, expected)
|
|
| def test_nested_lists():
| s = pd.Series([[[1, 2, 3]], [1, 2], 1])
| result = s.explode()
| expected = pd.Series([[1, 2, 3], 1, 2, 1], index=[0, 1, 1, 2])
| tm.assert_series_equal(result, expected)
|
|
| def test_multi_index():
| s = pd.Series(
| [[0, 1, 2], np.nan, [], (3, 4)],
| name="foo",
| index=pd.MultiIndex.from_product([list("ab"), range(2)], names=["foo", "bar"]),
| )
| result = s.explode()
| index = pd.MultiIndex.from_tuples(
| [("a", 0), ("a", 0), ("a", 0), ("a", 1), ("b", 0), ("b", 1), ("b", 1)],
| names=["foo", "bar"],
| )
| expected = pd.Series(
| [0, 1, 2, np.nan, np.nan, 3, 4], index=index, dtype=object, name="foo"
| )
| tm.assert_series_equal(result, expected)
|
|
| def test_large():
| s = pd.Series([range(256)]).explode()
| result = s.explode()
| tm.assert_series_equal(result, s)
|
|
| def test_invert_array():
| df = pd.DataFrame({"a": pd.date_range("20190101", periods=3, tz="UTC")})
|
| listify = df.apply(lambda x: x.array, axis=1)
| result = listify.explode()
| tm.assert_series_equal(result, df["a"].rename())
|
|
| @pytest.mark.parametrize(
| "s", [pd.Series([1, 2, 3]), pd.Series(pd.date_range("2019", periods=3, tz="UTC"))]
| )
| def test_non_object_dtype(s):
| result = s.explode()
| tm.assert_series_equal(result, s)
|
|
| def test_typical_usecase():
| df = pd.DataFrame(
| [{"var1": "a,b,c", "var2": 1}, {"var1": "d,e,f", "var2": 2}],
| columns=["var1", "var2"],
| )
| exploded = df.var1.str.split(",").explode()
| result = df[["var2"]].join(exploded)
| expected = pd.DataFrame(
| {"var2": [1, 1, 1, 2, 2, 2], "var1": list("abcdef")},
| columns=["var2", "var1"],
| index=[0, 0, 0, 1, 1, 1],
| )
| tm.assert_frame_equal(result, expected)
|
|
| def test_nested_EA():
| # a nested EA array
| s = pd.Series(
| [
| pd.date_range("20170101", periods=3, tz="UTC"),
| pd.date_range("20170104", periods=3, tz="UTC"),
| ]
| )
| result = s.explode()
| expected = pd.Series(
| pd.date_range("20170101", periods=6, tz="UTC"), index=[0, 0, 0, 1, 1, 1]
| )
| tm.assert_series_equal(result, expected)
|
|
| def test_duplicate_index():
| # GH 28005
| s = pd.Series([[1, 2], [3, 4]], index=[0, 0])
| result = s.explode()
| expected = pd.Series([1, 2, 3, 4], index=[0, 0, 0, 0], dtype=object)
| tm.assert_series_equal(result, expected)
|
|
| def test_ignore_index():
| # GH 34932
| s = pd.Series([[1, 2], [3, 4]])
| result = s.explode(ignore_index=True)
| expected = pd.Series([1, 2, 3, 4], index=[0, 1, 2, 3], dtype=object)
| tm.assert_series_equal(result, expected)
|
|
| def test_explode_sets():
| # https://github.com/pandas-dev/pandas/issues/35614
| s = pd.Series([{"a", "b", "c"}], index=[1])
| result = s.explode().sort_values()
| expected = pd.Series(["a", "b", "c"], index=[1, 1, 1])
| tm.assert_series_equal(result, expected)
|
|
| def test_explode_scalars_can_ignore_index():
| # https://github.com/pandas-dev/pandas/issues/40487
| s = pd.Series([1, 2, 3], index=["a", "b", "c"])
| result = s.explode(ignore_index=True)
| expected = pd.Series([1, 2, 3])
| tm.assert_series_equal(result, expected)
|
|
| @pytest.mark.parametrize("ignore_index", [True, False])
| def test_explode_pyarrow_list_type(ignore_index):
| # GH 53602
| pa = pytest.importorskip("pyarrow")
|
| data = [
| [None, None],
| [1],
| [],
| [2, 3],
| None,
| ]
| ser = pd.Series(data, dtype=pd.ArrowDtype(pa.list_(pa.int64())))
| result = ser.explode(ignore_index=ignore_index)
| expected = pd.Series(
| data=[None, None, 1, None, 2, 3, None],
| index=None if ignore_index else [0, 0, 1, 2, 3, 3, 4],
| dtype=pd.ArrowDtype(pa.int64()),
| )
| tm.assert_series_equal(result, expected)
|
|
| @pytest.mark.parametrize("ignore_index", [True, False])
| def test_explode_pyarrow_non_list_type(ignore_index):
| pa = pytest.importorskip("pyarrow")
| data = [1, 2, 3]
| ser = pd.Series(data, dtype=pd.ArrowDtype(pa.int64()))
| result = ser.explode(ignore_index=ignore_index)
| expected = pd.Series([1, 2, 3], dtype="int64[pyarrow]", index=[0, 1, 2])
| tm.assert_series_equal(result, expected)
|
|
| def test_str_dtype():
| # https://github.com/pandas-dev/pandas/pull/61623
| ser = pd.Series(["x", "y"], dtype="str")
| result = ser.explode()
| assert result is not ser
| tm.assert_series_equal(result, ser)
|
|
