372 lines
11 KiB
Python
372 lines
11 KiB
Python
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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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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@pytest.fixture
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def frame_with_period_index():
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return DataFrame(
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data=np.arange(20).reshape(4, 5),
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columns=list("abcde"),
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index=period_range(start="2000", freq="A", periods=4),
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)
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@pytest.fixture
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def left():
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return DataFrame({"a": [20, 10, 0]}, index=[2, 1, 0])
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@pytest.fixture
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def right():
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return DataFrame({"b": [300, 100, 200]}, index=[3, 1, 2])
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@pytest.mark.parametrize(
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"how, sort, expected",
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[
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("inner", False, DataFrame({"a": [20, 10], "b": [200, 100]}, index=[2, 1])),
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("inner", True, DataFrame({"a": [10, 20], "b": [100, 200]}, index=[1, 2])),
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(
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"left",
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False,
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DataFrame({"a": [20, 10, 0], "b": [200, 100, np.nan]}, index=[2, 1, 0]),
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),
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(
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"left",
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True,
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DataFrame({"a": [0, 10, 20], "b": [np.nan, 100, 200]}, index=[0, 1, 2]),
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),
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(
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"right",
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False,
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DataFrame({"a": [np.nan, 10, 20], "b": [300, 100, 200]}, index=[3, 1, 2]),
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),
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(
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"right",
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True,
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DataFrame({"a": [10, 20, np.nan], "b": [100, 200, 300]}, index=[1, 2, 3]),
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),
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(
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"outer",
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False,
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DataFrame(
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{"a": [0, 10, 20, np.nan], "b": [np.nan, 100, 200, 300]},
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index=[0, 1, 2, 3],
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),
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),
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(
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"outer",
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True,
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DataFrame(
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{"a": [0, 10, 20, np.nan], "b": [np.nan, 100, 200, 300]},
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index=[0, 1, 2, 3],
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),
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),
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],
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)
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def test_join(left, right, how, sort, expected):
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result = left.join(right, how=how, sort=sort)
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tm.assert_frame_equal(result, expected)
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def test_join_index(float_frame):
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# left / right
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f = float_frame.loc[float_frame.index[:10], ["A", "B"]]
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f2 = float_frame.loc[float_frame.index[5:], ["C", "D"]].iloc[::-1]
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joined = f.join(f2)
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tm.assert_index_equal(f.index, joined.index)
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expected_columns = Index(["A", "B", "C", "D"])
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tm.assert_index_equal(joined.columns, expected_columns)
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joined = f.join(f2, how="left")
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tm.assert_index_equal(joined.index, f.index)
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tm.assert_index_equal(joined.columns, expected_columns)
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joined = f.join(f2, how="right")
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tm.assert_index_equal(joined.index, f2.index)
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tm.assert_index_equal(joined.columns, expected_columns)
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# inner
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joined = f.join(f2, how="inner")
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tm.assert_index_equal(joined.index, f.index[5:10])
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tm.assert_index_equal(joined.columns, expected_columns)
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# outer
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joined = f.join(f2, how="outer")
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tm.assert_index_equal(joined.index, float_frame.index.sort_values())
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tm.assert_index_equal(joined.columns, expected_columns)
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with pytest.raises(ValueError, match="join method"):
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f.join(f2, how="foo")
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# corner case - overlapping columns
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msg = "columns overlap but no suffix"
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for how in ("outer", "left", "inner"):
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with pytest.raises(ValueError, match=msg):
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float_frame.join(float_frame, how=how)
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def test_join_index_more(float_frame):
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af = float_frame.loc[:, ["A", "B"]]
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bf = float_frame.loc[::2, ["C", "D"]]
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expected = af.copy()
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expected["C"] = float_frame["C"][::2]
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expected["D"] = float_frame["D"][::2]
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result = af.join(bf)
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tm.assert_frame_equal(result, expected)
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result = af.join(bf, how="right")
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tm.assert_frame_equal(result, expected[::2])
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result = bf.join(af, how="right")
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tm.assert_frame_equal(result, expected.loc[:, result.columns])
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def test_join_index_series(float_frame):
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df = float_frame.copy()
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ser = df.pop(float_frame.columns[-1])
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joined = df.join(ser)
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tm.assert_frame_equal(joined, float_frame)
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ser.name = None
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with pytest.raises(ValueError, match="must have a name"):
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df.join(ser)
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def test_join_overlap(float_frame):
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df1 = float_frame.loc[:, ["A", "B", "C"]]
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df2 = float_frame.loc[:, ["B", "C", "D"]]
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joined = df1.join(df2, lsuffix="_df1", rsuffix="_df2")
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df1_suf = df1.loc[:, ["B", "C"]].add_suffix("_df1")
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df2_suf = df2.loc[:, ["B", "C"]].add_suffix("_df2")
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no_overlap = float_frame.loc[:, ["A", "D"]]
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expected = df1_suf.join(df2_suf).join(no_overlap)
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# column order not necessarily sorted
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tm.assert_frame_equal(joined, expected.loc[:, joined.columns])
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def test_join_period_index(frame_with_period_index):
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other = frame_with_period_index.rename(columns=lambda key: f"{key}{key}")
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joined_values = np.concatenate([frame_with_period_index.values] * 2, axis=1)
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joined_cols = frame_with_period_index.columns.append(other.columns)
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joined = frame_with_period_index.join(other)
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expected = DataFrame(
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data=joined_values, columns=joined_cols, index=frame_with_period_index.index
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)
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tm.assert_frame_equal(joined, expected)
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def test_join_left_sequence_non_unique_index():
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# https://github.com/pandas-dev/pandas/issues/19607
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df1 = DataFrame({"a": [0, 10, 20]}, index=[1, 2, 3])
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df2 = DataFrame({"b": [100, 200, 300]}, index=[4, 3, 2])
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df3 = DataFrame({"c": [400, 500, 600]}, index=[2, 2, 4])
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joined = df1.join([df2, df3], how="left")
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expected = DataFrame(
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{
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"a": [0, 10, 10, 20],
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"b": [np.nan, 300, 300, 200],
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"c": [np.nan, 400, 500, np.nan],
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},
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index=[1, 2, 2, 3],
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)
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tm.assert_frame_equal(joined, expected)
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@pytest.mark.parametrize("sort_kw", [True, False])
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def test_suppress_future_warning_with_sort_kw(sort_kw):
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a = DataFrame({"col1": [1, 2]}, index=["c", "a"])
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b = DataFrame({"col2": [4, 5]}, index=["b", "a"])
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c = DataFrame({"col3": [7, 8]}, index=["a", "b"])
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expected = DataFrame(
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{
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"col1": {"a": 2.0, "b": float("nan"), "c": 1.0},
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"col2": {"a": 5.0, "b": 4.0, "c": float("nan")},
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"col3": {"a": 7.0, "b": 8.0, "c": float("nan")},
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}
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)
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if sort_kw is False:
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expected = expected.reindex(index=["c", "a", "b"])
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with tm.assert_produces_warning(None):
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result = a.join([b, c], how="outer", sort=sort_kw)
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tm.assert_frame_equal(result, expected)
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class TestDataFrameJoin:
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def test_join(self, multiindex_dataframe_random_data):
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frame = multiindex_dataframe_random_data
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a = frame.loc[frame.index[:5], ["A"]]
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b = frame.loc[frame.index[2:], ["B", "C"]]
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joined = a.join(b, how="outer").reindex(frame.index)
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expected = frame.copy().values
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expected[np.isnan(joined.values)] = np.nan
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expected = DataFrame(expected, index=frame.index, columns=frame.columns)
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assert not np.isnan(joined.values).all()
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tm.assert_frame_equal(joined, expected)
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def test_join_segfault(self):
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# GH#1532
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df1 = DataFrame({"a": [1, 1], "b": [1, 2], "x": [1, 2]})
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df2 = DataFrame({"a": [2, 2], "b": [1, 2], "y": [1, 2]})
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df1 = df1.set_index(["a", "b"])
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df2 = df2.set_index(["a", "b"])
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# it works!
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for how in ["left", "right", "outer"]:
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df1.join(df2, how=how)
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def test_join_str_datetime(self):
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str_dates = ["20120209", "20120222"]
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dt_dates = [datetime(2012, 2, 9), datetime(2012, 2, 22)]
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A = DataFrame(str_dates, index=range(2), columns=["aa"])
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C = DataFrame([[1, 2], [3, 4]], index=str_dates, columns=dt_dates)
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tst = A.join(C, on="aa")
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assert len(tst.columns) == 3
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def test_join_multiindex_leftright(self):
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# GH 10741
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df1 = DataFrame(
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[
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["a", "x", 0.471780],
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["a", "y", 0.774908],
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["a", "z", 0.563634],
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["b", "x", -0.353756],
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["b", "y", 0.368062],
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["b", "z", -1.721840],
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["c", "x", 1],
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["c", "y", 2],
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["c", "z", 3],
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],
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columns=["first", "second", "value1"],
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).set_index(["first", "second"])
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df2 = DataFrame([["a", 10], ["b", 20]], columns=["first", "value2"]).set_index(
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["first"]
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)
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exp = DataFrame(
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[
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[0.471780, 10],
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[0.774908, 10],
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[0.563634, 10],
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[-0.353756, 20],
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[0.368062, 20],
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[-1.721840, 20],
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[1.000000, np.nan],
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[2.000000, np.nan],
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[3.000000, np.nan],
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],
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index=df1.index,
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columns=["value1", "value2"],
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)
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# these must be the same results (but columns are flipped)
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tm.assert_frame_equal(df1.join(df2, how="left"), exp)
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tm.assert_frame_equal(df2.join(df1, how="right"), exp[["value2", "value1"]])
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exp_idx = MultiIndex.from_product(
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[["a", "b"], ["x", "y", "z"]], names=["first", "second"]
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)
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exp = DataFrame(
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[
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[0.471780, 10],
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[0.774908, 10],
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[0.563634, 10],
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[-0.353756, 20],
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[0.368062, 20],
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[-1.721840, 20],
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],
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index=exp_idx,
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columns=["value1", "value2"],
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)
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tm.assert_frame_equal(df1.join(df2, how="right"), exp)
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tm.assert_frame_equal(df2.join(df1, how="left"), exp[["value2", "value1"]])
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def test_merge_join_different_levels(self):
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# GH#9455
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# first dataframe
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df1 = DataFrame(columns=["a", "b"], data=[[1, 11], [0, 22]])
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# second dataframe
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columns = MultiIndex.from_tuples([("a", ""), ("c", "c1")])
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df2 = DataFrame(columns=columns, data=[[1, 33], [0, 44]])
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# merge
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columns = ["a", "b", ("c", "c1")]
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expected = DataFrame(columns=columns, data=[[1, 11, 33], [0, 22, 44]])
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with tm.assert_produces_warning(FutureWarning):
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result = pd.merge(df1, df2, on="a")
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tm.assert_frame_equal(result, expected)
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# join, see discussion in GH#12219
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columns = ["a", "b", ("a", ""), ("c", "c1")]
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expected = DataFrame(columns=columns, data=[[1, 11, 0, 44], [0, 22, 1, 33]])
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msg = "merging between different levels is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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# stacklevel is chosen to be correct for pd.merge, not DataFrame.join
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result = df1.join(df2, on="a")
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tm.assert_frame_equal(result, expected)
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def test_frame_join_tzaware(self):
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test1 = DataFrame(
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np.zeros((6, 3)),
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index=date_range(
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"2012-11-15 00:00:00", periods=6, freq="100L", tz="US/Central"
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),
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)
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test2 = DataFrame(
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np.zeros((3, 3)),
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index=date_range(
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"2012-11-15 00:00:00", periods=3, freq="250L", tz="US/Central"
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),
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columns=range(3, 6),
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)
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result = test1.join(test2, how="outer")
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expected = test1.index.union(test2.index)
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tm.assert_index_equal(result.index, expected)
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assert result.index.tz.zone == "US/Central"
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