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import numpy as np
import pytest
from pandas import (
PeriodIndex,
Series,
date_range,
period_range,
timedelta_range,
)
import pandas._testing as tm
class DropDuplicates:
def test_drop_duplicates_metadata(self, idx):
# GH#10115
result = idx.drop_duplicates()
tm.assert_index_equal(idx, result)
assert idx.freq == result.freq
idx_dup = idx.append(idx)
result = idx_dup.drop_duplicates()
expected = idx
if not isinstance(idx, PeriodIndex):
# freq is reset except for PeriodIndex
assert idx_dup.freq is None
assert result.freq is None
expected = idx._with_freq(None)
else:
assert result.freq == expected.freq
tm.assert_index_equal(result, expected)
@pytest.mark.parametrize(
"keep, expected, index",
[
(
"first",
np.concatenate(([False] * 10, [True] * 5)),
np.arange(0, 10, dtype=np.int64),
),
(
"last",
np.concatenate(([True] * 5, [False] * 10)),
np.arange(5, 15, dtype=np.int64),
),
(
False,
np.concatenate(([True] * 5, [False] * 5, [True] * 5)),
np.arange(5, 10, dtype=np.int64),
),
],
)
def test_drop_duplicates(self, keep, expected, index, idx):
# to check Index/Series compat
idx = idx.append(idx[:5])
tm.assert_numpy_array_equal(idx.duplicated(keep=keep), expected)
expected = idx[~expected]
result = idx.drop_duplicates(keep=keep)
tm.assert_index_equal(result, expected)
result = Series(idx).drop_duplicates(keep=keep)
expected = Series(expected, index=index)
tm.assert_series_equal(result, expected)
class TestDropDuplicatesPeriodIndex(DropDuplicates):
@pytest.fixture(params=["D", "3D", "H", "2H", "T", "2T", "S", "3S"])
def freq(self, request):
return request.param
@pytest.fixture
def idx(self, freq):
return period_range("2011-01-01", periods=10, freq=freq, name="idx")
class TestDropDuplicatesDatetimeIndex(DropDuplicates):
@pytest.fixture
def idx(self, freq_sample):
return date_range("2011-01-01", freq=freq_sample, periods=10, name="idx")
class TestDropDuplicatesTimedeltaIndex(DropDuplicates):
@pytest.fixture
def idx(self, freq_sample):
return timedelta_range("1 day", periods=10, freq=freq_sample, name="idx")