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47 lines
1.3 KiB
47 lines
1.3 KiB
import pytest
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from pandas import (
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DatetimeIndex,
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Index,
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MultiIndex,
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Period,
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date_range,
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)
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import pandas._testing as tm
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class TestMap:
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def test_map(self):
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rng = date_range("1/1/2000", periods=10)
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f = lambda x: x.strftime("%Y%m%d")
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result = rng.map(f)
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exp = Index([f(x) for x in rng], dtype="<U8")
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tm.assert_index_equal(result, exp)
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def test_map_fallthrough(self, capsys):
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# GH#22067, check we don't get warnings about silently ignored errors
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dti = date_range("2017-01-01", "2018-01-01", freq="B")
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dti.map(lambda x: Period(year=x.year, month=x.month, freq="M"))
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captured = capsys.readouterr()
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assert captured.err == ""
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def test_map_bug_1677(self):
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index = DatetimeIndex(["2012-04-25 09:30:00.393000"])
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f = index.asof
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result = index.map(f)
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expected = Index([f(index[0])])
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tm.assert_index_equal(result, expected)
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@pytest.mark.parametrize("name", [None, "name"])
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def test_index_map(self, name):
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# see GH#20990
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count = 6
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index = date_range("2018-01-01", periods=count, freq="M", name=name).map(
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lambda x: (x.year, x.month)
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)
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exp_index = MultiIndex.from_product(((2018,), range(1, 7)), names=[name, name])
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tm.assert_index_equal(index, exp_index)
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