import numpy as np
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import pytest
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from pandas import (
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DataFrame,
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PeriodIndex,
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Series,
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date_range,
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period_range,
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)
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import pandas._testing as tm
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class TestPeriodIndex:
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def test_getitem_periodindex_duplicates_string_slice(self, using_copy_on_write):
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# monotonic
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idx = PeriodIndex([2000, 2007, 2007, 2009, 2009], freq="A-JUN")
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ts = Series(np.random.randn(len(idx)), index=idx)
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original = ts.copy()
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result = ts["2007"]
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expected = ts[1:3]
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tm.assert_series_equal(result, expected)
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result[:] = 1
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if using_copy_on_write:
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tm.assert_series_equal(ts, original)
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else:
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assert (ts[1:3] == 1).all()
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# not monotonic
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idx = PeriodIndex([2000, 2007, 2007, 2009, 2007], freq="A-JUN")
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ts = Series(np.random.randn(len(idx)), index=idx)
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result = ts["2007"]
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expected = ts[idx == "2007"]
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tm.assert_series_equal(result, expected)
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def test_getitem_periodindex_quarter_string(self):
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pi = PeriodIndex(["2Q05", "3Q05", "4Q05", "1Q06", "2Q06"], freq="Q")
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ser = Series(np.random.rand(len(pi)), index=pi).cumsum()
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# Todo: fix these accessors!
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assert ser["05Q4"] == ser[2]
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def test_pindex_slice_index(self):
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pi = period_range(start="1/1/10", end="12/31/12", freq="M")
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s = Series(np.random.rand(len(pi)), index=pi)
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res = s["2010"]
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exp = s[0:12]
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tm.assert_series_equal(res, exp)
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res = s["2011"]
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exp = s[12:24]
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tm.assert_series_equal(res, exp)
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@pytest.mark.parametrize("make_range", [date_range, period_range])
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def test_range_slice_day(self, make_range):
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# GH#6716
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idx = make_range(start="2013/01/01", freq="D", periods=400)
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msg = "slice indices must be integers or None or have an __index__ method"
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# slices against index should raise IndexError
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values = [
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"2014",
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"2013/02",
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"2013/01/02",
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"2013/02/01 9H",
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"2013/02/01 09:00",
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]
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for v in values:
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with pytest.raises(TypeError, match=msg):
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idx[v:]
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s = Series(np.random.rand(len(idx)), index=idx)
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tm.assert_series_equal(s["2013/01/02":], s[1:])
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tm.assert_series_equal(s["2013/01/02":"2013/01/05"], s[1:5])
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tm.assert_series_equal(s["2013/02":], s[31:])
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tm.assert_series_equal(s["2014":], s[365:])
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invalid = ["2013/02/01 9H", "2013/02/01 09:00"]
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for v in invalid:
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with pytest.raises(TypeError, match=msg):
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idx[v:]
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@pytest.mark.parametrize("make_range", [date_range, period_range])
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def test_range_slice_seconds(self, make_range):
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# GH#6716
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idx = make_range(start="2013/01/01 09:00:00", freq="S", periods=4000)
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msg = "slice indices must be integers or None or have an __index__ method"
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# slices against index should raise IndexError
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values = [
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"2014",
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"2013/02",
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"2013/01/02",
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"2013/02/01 9H",
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"2013/02/01 09:00",
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]
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for v in values:
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with pytest.raises(TypeError, match=msg):
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idx[v:]
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s = Series(np.random.rand(len(idx)), index=idx)
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tm.assert_series_equal(s["2013/01/01 09:05":"2013/01/01 09:10"], s[300:660])
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tm.assert_series_equal(s["2013/01/01 10:00":"2013/01/01 10:05"], s[3600:3960])
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tm.assert_series_equal(s["2013/01/01 10H":], s[3600:])
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tm.assert_series_equal(s[:"2013/01/01 09:30"], s[:1860])
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for d in ["2013/01/01", "2013/01", "2013"]:
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tm.assert_series_equal(s[d:], s)
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@pytest.mark.parametrize("make_range", [date_range, period_range])
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def test_range_slice_outofbounds(self, make_range):
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# GH#5407
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idx = make_range(start="2013/10/01", freq="D", periods=10)
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df = DataFrame({"units": [100 + i for i in range(10)]}, index=idx)
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empty = DataFrame(index=type(idx)([], freq="D"), columns=["units"])
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empty["units"] = empty["units"].astype("int64")
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tm.assert_frame_equal(df["2013/09/01":"2013/09/30"], empty)
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tm.assert_frame_equal(df["2013/09/30":"2013/10/02"], df.iloc[:2])
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tm.assert_frame_equal(df["2013/10/01":"2013/10/02"], df.iloc[:2])
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tm.assert_frame_equal(df["2013/10/02":"2013/09/30"], empty)
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tm.assert_frame_equal(df["2013/10/15":"2013/10/17"], empty)
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tm.assert_frame_equal(df["2013-06":"2013-09"], empty)
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tm.assert_frame_equal(df["2013-11":"2013-12"], empty)
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@pytest.mark.parametrize("make_range", [date_range, period_range])
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def test_maybe_cast_slice_bound(self, make_range, frame_or_series):
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idx = make_range(start="2013/10/01", freq="D", periods=10)
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obj = DataFrame({"units": [100 + i for i in range(10)]}, index=idx)
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obj = tm.get_obj(obj, frame_or_series)
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msg = (
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f"cannot do slice indexing on {type(idx).__name__} with "
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r"these indexers \[foo\] of type str"
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)
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# Check the lower-level calls are raising where expected.
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with pytest.raises(TypeError, match=msg):
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idx._maybe_cast_slice_bound("foo", "left")
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with pytest.raises(TypeError, match=msg):
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idx.get_slice_bound("foo", "left")
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with pytest.raises(TypeError, match=msg):
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obj["2013/09/30":"foo"]
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with pytest.raises(TypeError, match=msg):
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obj["foo":"2013/09/30"]
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with pytest.raises(TypeError, match=msg):
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obj.loc["2013/09/30":"foo"]
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with pytest.raises(TypeError, match=msg):
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obj.loc["foo":"2013/09/30"]
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def test_partial_slice_doesnt_require_monotonicity(self):
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# See also: DatetimeIndex test ofm the same name
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dti = date_range("2014-01-01", periods=30, freq="30D")
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pi = dti.to_period("D")
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ser_montonic = Series(np.arange(30), index=pi)
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shuffler = list(range(0, 30, 2)) + list(range(1, 31, 2))
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ser = ser_montonic[shuffler]
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nidx = ser.index
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# Manually identified locations of year==2014
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indexer_2014 = np.array(
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[0, 1, 2, 3, 4, 5, 6, 15, 16, 17, 18, 19, 20], dtype=np.intp
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)
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assert (nidx[indexer_2014].year == 2014).all()
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assert not (nidx[~indexer_2014].year == 2014).any()
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result = nidx.get_loc("2014")
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tm.assert_numpy_array_equal(result, indexer_2014)
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expected = ser[indexer_2014]
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result = ser.loc["2014"]
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tm.assert_series_equal(result, expected)
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result = ser["2014"]
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tm.assert_series_equal(result, expected)
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# Manually identified locations where ser.index is within Mat 2015
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indexer_may2015 = np.array([23], dtype=np.intp)
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assert nidx[23].year == 2015 and nidx[23].month == 5
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result = nidx.get_loc("May 2015")
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tm.assert_numpy_array_equal(result, indexer_may2015)
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expected = ser[indexer_may2015]
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result = ser.loc["May 2015"]
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tm.assert_series_equal(result, expected)
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result = ser["May 2015"]
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tm.assert_series_equal(result, expected)
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