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304 lines
11 KiB
304 lines
11 KiB
import numpy as np
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import pytest
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import pytz
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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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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 TestDataFrameAlign:
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def test_frame_align_aware(self):
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idx1 = date_range("2001", periods=5, freq="H", tz="US/Eastern")
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idx2 = date_range("2001", periods=5, freq="2H", tz="US/Eastern")
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df1 = DataFrame(np.random.randn(len(idx1), 3), idx1)
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df2 = DataFrame(np.random.randn(len(idx2), 3), idx2)
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new1, new2 = df1.align(df2)
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assert df1.index.tz == new1.index.tz
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assert df2.index.tz == new2.index.tz
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# different timezones convert to UTC
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# frame with frame
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df1_central = df1.tz_convert("US/Central")
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new1, new2 = df1.align(df1_central)
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assert new1.index.tz == pytz.UTC
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assert new2.index.tz == pytz.UTC
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# frame with Series
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new1, new2 = df1.align(df1_central[0], axis=0)
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assert new1.index.tz == pytz.UTC
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assert new2.index.tz == pytz.UTC
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df1[0].align(df1_central, axis=0)
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assert new1.index.tz == pytz.UTC
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assert new2.index.tz == pytz.UTC
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def test_align_float(self, float_frame):
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af, bf = float_frame.align(float_frame)
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assert af._mgr is not float_frame._mgr
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af, bf = float_frame.align(float_frame, copy=False)
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assert af._mgr is float_frame._mgr
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# axis = 0
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other = float_frame.iloc[:-5, :3]
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af, bf = float_frame.align(other, axis=0, fill_value=-1)
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tm.assert_index_equal(bf.columns, other.columns)
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# test fill value
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join_idx = float_frame.index.join(other.index)
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diff_a = float_frame.index.difference(join_idx)
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diff_a_vals = af.reindex(diff_a).values
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assert (diff_a_vals == -1).all()
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af, bf = float_frame.align(other, join="right", axis=0)
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tm.assert_index_equal(bf.columns, other.columns)
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tm.assert_index_equal(bf.index, other.index)
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tm.assert_index_equal(af.index, other.index)
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# axis = 1
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other = float_frame.iloc[:-5, :3].copy()
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af, bf = float_frame.align(other, axis=1)
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tm.assert_index_equal(bf.columns, float_frame.columns)
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tm.assert_index_equal(bf.index, other.index)
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# test fill value
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join_idx = float_frame.index.join(other.index)
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diff_a = float_frame.index.difference(join_idx)
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diff_a_vals = af.reindex(diff_a).values
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assert (diff_a_vals == -1).all()
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af, bf = float_frame.align(other, join="inner", axis=1)
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tm.assert_index_equal(bf.columns, other.columns)
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af, bf = float_frame.align(other, join="inner", axis=1, method="pad")
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tm.assert_index_equal(bf.columns, other.columns)
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af, bf = float_frame.align(
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other.iloc[:, 0], join="inner", axis=1, method=None, fill_value=None
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)
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tm.assert_index_equal(bf.index, Index([]))
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af, bf = float_frame.align(
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other.iloc[:, 0], join="inner", axis=1, method=None, fill_value=0
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)
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tm.assert_index_equal(bf.index, Index([]))
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# Try to align DataFrame to Series along bad axis
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msg = "No axis named 2 for object type DataFrame"
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with pytest.raises(ValueError, match=msg):
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float_frame.align(af.iloc[0, :3], join="inner", axis=2)
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# align dataframe to series with broadcast or not
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idx = float_frame.index
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s = Series(range(len(idx)), index=idx)
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left, right = float_frame.align(s, axis=0)
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tm.assert_index_equal(left.index, float_frame.index)
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tm.assert_index_equal(right.index, float_frame.index)
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assert isinstance(right, Series)
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left, right = float_frame.align(s, broadcast_axis=1)
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tm.assert_index_equal(left.index, float_frame.index)
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expected = {c: s for c in float_frame.columns}
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expected = DataFrame(
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expected, index=float_frame.index, columns=float_frame.columns
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)
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tm.assert_frame_equal(right, expected)
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# see gh-9558
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df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
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result = df[df["a"] == 2]
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expected = DataFrame([[2, 5]], index=[1], columns=["a", "b"])
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tm.assert_frame_equal(result, expected)
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result = df.where(df["a"] == 2, 0)
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expected = DataFrame({"a": [0, 2, 0], "b": [0, 5, 0]})
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tm.assert_frame_equal(result, expected)
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def test_align_int(self, int_frame):
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# test other non-float types
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other = DataFrame(index=range(5), columns=["A", "B", "C"])
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af, bf = int_frame.align(other, join="inner", axis=1, method="pad")
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tm.assert_index_equal(bf.columns, other.columns)
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def test_align_mixed_type(self, float_string_frame):
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af, bf = float_string_frame.align(
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float_string_frame, join="inner", axis=1, method="pad"
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)
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tm.assert_index_equal(bf.columns, float_string_frame.columns)
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def test_align_mixed_float(self, mixed_float_frame):
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# mixed floats/ints
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other = DataFrame(index=range(5), columns=["A", "B", "C"])
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af, bf = mixed_float_frame.align(
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other.iloc[:, 0], join="inner", axis=1, method=None, fill_value=0
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)
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tm.assert_index_equal(bf.index, Index([]))
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def test_align_mixed_int(self, mixed_int_frame):
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other = DataFrame(index=range(5), columns=["A", "B", "C"])
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af, bf = mixed_int_frame.align(
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other.iloc[:, 0], join="inner", axis=1, method=None, fill_value=0
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)
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tm.assert_index_equal(bf.index, Index([]))
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@pytest.mark.parametrize(
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"l_ordered,r_ordered,expected",
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[
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[True, True, pd.CategoricalIndex],
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[True, False, Index],
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[False, True, Index],
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[False, False, pd.CategoricalIndex],
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],
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)
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def test_align_categorical(self, l_ordered, r_ordered, expected):
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# GH-28397
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df_1 = DataFrame(
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{
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"A": np.arange(6, dtype="int64"),
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"B": Series(list("aabbca")).astype(
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pd.CategoricalDtype(list("cab"), ordered=l_ordered)
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),
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}
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).set_index("B")
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df_2 = DataFrame(
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{
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"A": np.arange(5, dtype="int64"),
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"B": Series(list("babca")).astype(
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pd.CategoricalDtype(list("cab"), ordered=r_ordered)
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),
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}
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).set_index("B")
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aligned_1, aligned_2 = df_1.align(df_2)
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assert isinstance(aligned_1.index, expected)
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assert isinstance(aligned_2.index, expected)
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tm.assert_index_equal(aligned_1.index, aligned_2.index)
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def test_align_multiindex(self):
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# GH#10665
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# same test cases as test_align_multiindex in test_series.py
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midx = pd.MultiIndex.from_product(
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[range(2), range(3), range(2)], names=("a", "b", "c")
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)
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idx = Index(range(2), name="b")
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df1 = DataFrame(np.arange(12, dtype="int64"), index=midx)
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df2 = DataFrame(np.arange(2, dtype="int64"), index=idx)
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# these must be the same results (but flipped)
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res1l, res1r = df1.align(df2, join="left")
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res2l, res2r = df2.align(df1, join="right")
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expl = df1
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tm.assert_frame_equal(expl, res1l)
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tm.assert_frame_equal(expl, res2r)
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expr = DataFrame([0, 0, 1, 1, np.nan, np.nan] * 2, index=midx)
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tm.assert_frame_equal(expr, res1r)
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tm.assert_frame_equal(expr, res2l)
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res1l, res1r = df1.align(df2, join="right")
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res2l, res2r = df2.align(df1, join="left")
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exp_idx = pd.MultiIndex.from_product(
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[range(2), range(2), range(2)], names=("a", "b", "c")
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)
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expl = DataFrame([0, 1, 2, 3, 6, 7, 8, 9], index=exp_idx)
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tm.assert_frame_equal(expl, res1l)
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tm.assert_frame_equal(expl, res2r)
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expr = DataFrame([0, 0, 1, 1] * 2, index=exp_idx)
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tm.assert_frame_equal(expr, res1r)
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tm.assert_frame_equal(expr, res2l)
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def test_align_series_combinations(self):
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df = DataFrame({"a": [1, 3, 5], "b": [1, 3, 5]}, index=list("ACE"))
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s = Series([1, 2, 4], index=list("ABD"), name="x")
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# frame + series
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res1, res2 = df.align(s, axis=0)
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exp1 = DataFrame(
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{"a": [1, np.nan, 3, np.nan, 5], "b": [1, np.nan, 3, np.nan, 5]},
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index=list("ABCDE"),
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)
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exp2 = Series([1, 2, np.nan, 4, np.nan], index=list("ABCDE"), name="x")
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tm.assert_frame_equal(res1, exp1)
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tm.assert_series_equal(res2, exp2)
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# series + frame
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res1, res2 = s.align(df)
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tm.assert_series_equal(res1, exp2)
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tm.assert_frame_equal(res2, exp1)
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def _check_align(self, a, b, axis, fill_axis, how, method, limit=None):
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aa, ab = a.align(
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b, axis=axis, join=how, method=method, limit=limit, fill_axis=fill_axis
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)
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join_index, join_columns = None, None
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ea, eb = a, b
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if axis is None or axis == 0:
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join_index = a.index.join(b.index, how=how)
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ea = ea.reindex(index=join_index)
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eb = eb.reindex(index=join_index)
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if axis is None or axis == 1:
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join_columns = a.columns.join(b.columns, how=how)
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ea = ea.reindex(columns=join_columns)
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eb = eb.reindex(columns=join_columns)
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ea = ea.fillna(axis=fill_axis, method=method, limit=limit)
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eb = eb.fillna(axis=fill_axis, method=method, limit=limit)
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tm.assert_frame_equal(aa, ea)
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tm.assert_frame_equal(ab, eb)
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@pytest.mark.parametrize("meth", ["pad", "bfill"])
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@pytest.mark.parametrize("ax", [0, 1, None])
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@pytest.mark.parametrize("fax", [0, 1])
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@pytest.mark.parametrize("how", ["inner", "outer", "left", "right"])
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def test_align_fill_method(self, how, meth, ax, fax, float_frame):
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df = float_frame
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self._check_align_fill(df, how, meth, ax, fax)
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def _check_align_fill(self, frame, kind, meth, ax, fax):
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left = frame.iloc[0:4, :10]
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right = frame.iloc[2:, 6:]
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empty = frame.iloc[:0, :0]
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self._check_align(left, right, axis=ax, fill_axis=fax, how=kind, method=meth)
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self._check_align(
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left, right, axis=ax, fill_axis=fax, how=kind, method=meth, limit=1
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)
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# empty left
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self._check_align(empty, right, axis=ax, fill_axis=fax, how=kind, method=meth)
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self._check_align(
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empty, right, axis=ax, fill_axis=fax, how=kind, method=meth, limit=1
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)
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# empty right
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self._check_align(left, empty, axis=ax, fill_axis=fax, how=kind, method=meth)
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self._check_align(
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left, empty, axis=ax, fill_axis=fax, how=kind, method=meth, limit=1
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)
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# both empty
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self._check_align(empty, empty, axis=ax, fill_axis=fax, how=kind, method=meth)
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self._check_align(
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empty, empty, axis=ax, fill_axis=fax, how=kind, method=meth, limit=1
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)
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