import pandas as pd
import pandas._testing as tm


def test_getitem_callable():
    # GH 12533
    s = pd.Series(4, index=list("ABCD"))
    result = s[lambda x: "A"]
    assert result == s.loc["A"]

    result = s[lambda x: ["A", "B"]]
    tm.assert_series_equal(result, s.loc[["A", "B"]])

    result = s[lambda x: [True, False, True, True]]
    tm.assert_series_equal(result, s.iloc[[0, 2, 3]])


def test_setitem_callable():
    # GH 12533
    s = pd.Series([1, 2, 3, 4], index=list("ABCD"))
    s[lambda x: "A"] = -1
    tm.assert_series_equal(s, pd.Series([-1, 2, 3, 4], index=list("ABCD")))


def test_setitem_other_callable():
    # GH 13299
    inc = lambda x: x + 1

    s = pd.Series([1, 2, -1, 4])
    s[s < 0] = inc

    expected = pd.Series([1, 2, inc, 4])
    tm.assert_series_equal(s, expected)