from datetime import datetime
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import numpy as np
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import pytest
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import pandas as pd
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from pandas import (
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DataFrame,
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Index,
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MultiIndex,
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RangeIndex,
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Series,
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date_range,
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)
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import pandas._testing as tm
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class TestResetIndex:
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def test_reset_index_dti_round_trip(self):
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dti = date_range(start="1/1/2001", end="6/1/2001", freq="D")._with_freq(None)
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d1 = DataFrame({"v": np.random.rand(len(dti))}, index=dti)
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d2 = d1.reset_index()
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assert d2.dtypes[0] == np.dtype("M8[ns]")
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d3 = d2.set_index("index")
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tm.assert_frame_equal(d1, d3, check_names=False)
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# GH#2329
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stamp = datetime(2012, 11, 22)
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df = DataFrame([[stamp, 12.1]], columns=["Date", "Value"])
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df = df.set_index("Date")
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assert df.index[0] == stamp
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assert df.reset_index()["Date"][0] == stamp
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def test_reset_index(self):
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df = tm.makeDataFrame()[:5]
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ser = df.stack()
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ser.index.names = ["hash", "category"]
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ser.name = "value"
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df = ser.reset_index()
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assert "value" in df
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df = ser.reset_index(name="value2")
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assert "value2" in df
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# check inplace
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s = ser.reset_index(drop=True)
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s2 = ser
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return_value = s2.reset_index(drop=True, inplace=True)
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assert return_value is None
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tm.assert_series_equal(s, s2)
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# level
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index = MultiIndex(
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levels=[["bar"], ["one", "two", "three"], [0, 1]],
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codes=[[0, 0, 0, 0, 0, 0], [0, 1, 2, 0, 1, 2], [0, 1, 0, 1, 0, 1]],
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)
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s = Series(np.random.randn(6), index=index)
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rs = s.reset_index(level=1)
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assert len(rs.columns) == 2
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rs = s.reset_index(level=[0, 2], drop=True)
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tm.assert_index_equal(rs.index, Index(index.get_level_values(1)))
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assert isinstance(rs, Series)
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def test_reset_index_name(self):
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s = Series([1, 2, 3], index=Index(range(3), name="x"))
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assert s.reset_index().index.name is None
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assert s.reset_index(drop=True).index.name is None
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def test_reset_index_level(self):
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df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=["A", "B", "C"])
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for levels in ["A", "B"], [0, 1]:
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# With MultiIndex
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s = df.set_index(["A", "B"])["C"]
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result = s.reset_index(level=levels[0])
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tm.assert_frame_equal(result, df.set_index("B"))
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result = s.reset_index(level=levels[:1])
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tm.assert_frame_equal(result, df.set_index("B"))
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result = s.reset_index(level=levels)
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tm.assert_frame_equal(result, df)
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result = df.set_index(["A", "B"]).reset_index(level=levels, drop=True)
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tm.assert_frame_equal(result, df[["C"]])
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with pytest.raises(KeyError, match="Level E "):
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s.reset_index(level=["A", "E"])
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# With single-level Index
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s = df.set_index("A")["B"]
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result = s.reset_index(level=levels[0])
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tm.assert_frame_equal(result, df[["A", "B"]])
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result = s.reset_index(level=levels[:1])
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tm.assert_frame_equal(result, df[["A", "B"]])
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result = s.reset_index(level=levels[0], drop=True)
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tm.assert_series_equal(result, df["B"])
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with pytest.raises(IndexError, match="Too many levels"):
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s.reset_index(level=[0, 1, 2])
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# Check that .reset_index([],drop=True) doesn't fail
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result = Series(range(4)).reset_index([], drop=True)
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expected = Series(range(4))
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tm.assert_series_equal(result, expected)
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def test_reset_index_range(self):
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# GH 12071
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s = Series(range(2), name="A", dtype="int64")
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series_result = s.reset_index()
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assert isinstance(series_result.index, RangeIndex)
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series_expected = DataFrame(
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[[0, 0], [1, 1]], columns=["index", "A"], index=RangeIndex(stop=2)
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)
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tm.assert_frame_equal(series_result, series_expected)
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def test_reset_index_drop_errors(self):
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# GH 20925
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# KeyError raised for series index when passed level name is missing
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s = Series(range(4))
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with pytest.raises(KeyError, match="does not match index name"):
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s.reset_index("wrong", drop=True)
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with pytest.raises(KeyError, match="does not match index name"):
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s.reset_index("wrong")
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# KeyError raised for series when level to be dropped is missing
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s = Series(range(4), index=MultiIndex.from_product([[1, 2]] * 2))
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with pytest.raises(KeyError, match="not found"):
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s.reset_index("wrong", drop=True)
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def test_reset_index_with_drop(self, series_with_multilevel_index):
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ser = series_with_multilevel_index
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deleveled = ser.reset_index()
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assert isinstance(deleveled, DataFrame)
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assert len(deleveled.columns) == len(ser.index.levels) + 1
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assert deleveled.index.name == ser.index.name
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deleveled = ser.reset_index(drop=True)
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assert isinstance(deleveled, Series)
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assert deleveled.index.name == ser.index.name
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def test_reset_index_inplace_and_drop_ignore_name(self):
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# GH#44575
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ser = Series(range(2), name="old")
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ser.reset_index(name="new", drop=True, inplace=True)
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expected = Series(range(2), name="old")
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tm.assert_series_equal(ser, expected)
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@pytest.mark.parametrize(
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"array, dtype",
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[
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(["a", "b"], object),
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(
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pd.period_range("12-1-2000", periods=2, freq="Q-DEC"),
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pd.PeriodDtype(freq="Q-DEC"),
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),
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],
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)
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def test_reset_index_dtypes_on_empty_series_with_multiindex(array, dtype):
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# GH 19602 - Preserve dtype on empty Series with MultiIndex
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idx = MultiIndex.from_product([[0, 1], [0.5, 1.0], array])
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result = Series(dtype=object, index=idx)[:0].reset_index().dtypes
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expected = Series(
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{"level_0": np.int64, "level_1": np.float64, "level_2": dtype, 0: object}
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)
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize(
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"names, expected_names",
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[
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(["A", "A"], ["A", "A"]),
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(["level_1", None], ["level_1", "level_1"]),
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],
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)
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@pytest.mark.parametrize("allow_duplicates", [False, True])
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def test_column_name_duplicates(names, expected_names, allow_duplicates):
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# GH#44755 reset_index with duplicate column labels
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s = Series([1], index=MultiIndex.from_arrays([[1], [1]], names=names))
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if allow_duplicates:
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result = s.reset_index(allow_duplicates=True)
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expected = DataFrame([[1, 1, 1]], columns=expected_names + [0])
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tm.assert_frame_equal(result, expected)
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else:
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with pytest.raises(ValueError, match="cannot insert"):
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s.reset_index()
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