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399 lines
12 KiB
399 lines
12 KiB
# Arithmetic tests for DataFrame/Series/Index/Array classes that should
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# behave identically.
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# Specifically for object dtype
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import datetime
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from decimal import Decimal
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import operator
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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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Series,
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Timestamp,
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)
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import pandas._testing as tm
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from pandas.core import ops
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# ------------------------------------------------------------------
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# Comparisons
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class TestObjectComparisons:
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def test_comparison_object_numeric_nas(self, comparison_op):
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ser = Series(np.random.default_rng(2).standard_normal(10), dtype=object)
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shifted = ser.shift(2)
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func = comparison_op
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result = func(ser, shifted)
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expected = func(ser.astype(float), shifted.astype(float))
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tm.assert_series_equal(result, expected)
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def test_object_comparisons(self):
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ser = Series(["a", "b", np.nan, "c", "a"])
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result = ser == "a"
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expected = Series([True, False, False, False, True])
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tm.assert_series_equal(result, expected)
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result = ser < "a"
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expected = Series([False, False, False, False, False])
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tm.assert_series_equal(result, expected)
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result = ser != "a"
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expected = -(ser == "a")
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("dtype", [None, object])
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def test_more_na_comparisons(self, dtype):
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left = Series(["a", np.nan, "c"], dtype=dtype)
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right = Series(["a", np.nan, "d"], dtype=dtype)
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result = left == right
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expected = Series([True, False, False])
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tm.assert_series_equal(result, expected)
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result = left != right
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expected = Series([False, True, True])
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tm.assert_series_equal(result, expected)
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result = left == np.nan
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expected = Series([False, False, False])
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tm.assert_series_equal(result, expected)
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result = left != np.nan
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expected = Series([True, True, True])
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tm.assert_series_equal(result, expected)
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# ------------------------------------------------------------------
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# Arithmetic
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class TestArithmetic:
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def test_add_period_to_array_of_offset(self):
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# GH#50162
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per = pd.Period("2012-1-1", freq="D")
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pi = pd.period_range("2012-1-1", periods=10, freq="D")
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idx = per - pi
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expected = pd.Index([x + per for x in idx], dtype=object)
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result = idx + per
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tm.assert_index_equal(result, expected)
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result = per + idx
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tm.assert_index_equal(result, expected)
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# TODO: parametrize
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def test_pow_ops_object(self):
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# GH#22922
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# pow is weird with masking & 1, so testing here
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a = Series([1, np.nan, 1, np.nan], dtype=object)
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b = Series([1, np.nan, np.nan, 1], dtype=object)
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result = a**b
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expected = Series(a.values**b.values, dtype=object)
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tm.assert_series_equal(result, expected)
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result = b**a
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expected = Series(b.values**a.values, dtype=object)
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("op", [operator.add, ops.radd])
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@pytest.mark.parametrize("other", ["category", "Int64"])
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def test_add_extension_scalar(self, other, box_with_array, op):
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# GH#22378
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# Check that scalars satisfying is_extension_array_dtype(obj)
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# do not incorrectly try to dispatch to an ExtensionArray operation
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arr = Series(["a", "b", "c"])
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expected = Series([op(x, other) for x in arr])
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arr = tm.box_expected(arr, box_with_array)
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expected = tm.box_expected(expected, box_with_array)
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result = op(arr, other)
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tm.assert_equal(result, expected)
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def test_objarr_add_str(self, box_with_array):
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ser = Series(["x", np.nan, "x"])
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expected = Series(["xa", np.nan, "xa"])
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ser = tm.box_expected(ser, box_with_array)
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expected = tm.box_expected(expected, box_with_array)
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result = ser + "a"
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tm.assert_equal(result, expected)
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def test_objarr_radd_str(self, box_with_array):
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ser = Series(["x", np.nan, "x"])
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expected = Series(["ax", np.nan, "ax"])
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ser = tm.box_expected(ser, box_with_array)
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expected = tm.box_expected(expected, box_with_array)
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result = "a" + ser
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tm.assert_equal(result, expected)
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@pytest.mark.parametrize(
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"data",
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[
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[1, 2, 3],
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[1.1, 2.2, 3.3],
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[Timestamp("2011-01-01"), Timestamp("2011-01-02"), pd.NaT],
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["x", "y", 1],
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],
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)
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@pytest.mark.parametrize("dtype", [None, object])
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def test_objarr_radd_str_invalid(self, dtype, data, box_with_array):
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ser = Series(data, dtype=dtype)
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ser = tm.box_expected(ser, box_with_array)
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msg = "|".join(
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[
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"can only concatenate str",
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"did not contain a loop with signature matching types",
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"unsupported operand type",
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"must be str",
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]
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)
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with pytest.raises(TypeError, match=msg):
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"foo_" + ser
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@pytest.mark.parametrize("op", [operator.add, ops.radd, operator.sub, ops.rsub])
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def test_objarr_add_invalid(self, op, box_with_array):
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# invalid ops
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box = box_with_array
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obj_ser = tm.makeObjectSeries()
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obj_ser.name = "objects"
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obj_ser = tm.box_expected(obj_ser, box)
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msg = "|".join(
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["can only concatenate str", "unsupported operand type", "must be str"]
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)
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with pytest.raises(Exception, match=msg):
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op(obj_ser, 1)
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with pytest.raises(Exception, match=msg):
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op(obj_ser, np.array(1, dtype=np.int64))
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# TODO: Moved from tests.series.test_operators; needs cleanup
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def test_operators_na_handling(self):
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ser = Series(["foo", "bar", "baz", np.nan])
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result = "prefix_" + ser
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expected = Series(["prefix_foo", "prefix_bar", "prefix_baz", np.nan])
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tm.assert_series_equal(result, expected)
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result = ser + "_suffix"
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expected = Series(["foo_suffix", "bar_suffix", "baz_suffix", np.nan])
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tm.assert_series_equal(result, expected)
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# TODO: parametrize over box
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@pytest.mark.parametrize("dtype", [None, object])
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def test_series_with_dtype_radd_timedelta(self, dtype):
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# note this test is _not_ aimed at timedelta64-dtyped Series
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# as of 2.0 we retain object dtype when ser.dtype == object
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ser = Series(
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[pd.Timedelta("1 days"), pd.Timedelta("2 days"), pd.Timedelta("3 days")],
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dtype=dtype,
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)
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expected = Series(
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[pd.Timedelta("4 days"), pd.Timedelta("5 days"), pd.Timedelta("6 days")],
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dtype=dtype,
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)
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result = pd.Timedelta("3 days") + ser
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tm.assert_series_equal(result, expected)
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result = ser + pd.Timedelta("3 days")
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tm.assert_series_equal(result, expected)
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# TODO: cleanup & parametrize over box
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def test_mixed_timezone_series_ops_object(self):
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# GH#13043
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ser = Series(
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[
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Timestamp("2015-01-01", tz="US/Eastern"),
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Timestamp("2015-01-01", tz="Asia/Tokyo"),
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],
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name="xxx",
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)
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assert ser.dtype == object
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exp = Series(
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[
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Timestamp("2015-01-02", tz="US/Eastern"),
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Timestamp("2015-01-02", tz="Asia/Tokyo"),
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],
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name="xxx",
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)
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tm.assert_series_equal(ser + pd.Timedelta("1 days"), exp)
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tm.assert_series_equal(pd.Timedelta("1 days") + ser, exp)
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# object series & object series
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ser2 = Series(
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[
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Timestamp("2015-01-03", tz="US/Eastern"),
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Timestamp("2015-01-05", tz="Asia/Tokyo"),
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],
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name="xxx",
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)
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assert ser2.dtype == object
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exp = Series(
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[pd.Timedelta("2 days"), pd.Timedelta("4 days")], name="xxx", dtype=object
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)
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tm.assert_series_equal(ser2 - ser, exp)
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tm.assert_series_equal(ser - ser2, -exp)
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ser = Series(
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[pd.Timedelta("01:00:00"), pd.Timedelta("02:00:00")],
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name="xxx",
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dtype=object,
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)
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assert ser.dtype == object
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exp = Series(
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[pd.Timedelta("01:30:00"), pd.Timedelta("02:30:00")],
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name="xxx",
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dtype=object,
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)
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tm.assert_series_equal(ser + pd.Timedelta("00:30:00"), exp)
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tm.assert_series_equal(pd.Timedelta("00:30:00") + ser, exp)
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# TODO: cleanup & parametrize over box
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def test_iadd_preserves_name(self):
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# GH#17067, GH#19723 __iadd__ and __isub__ should preserve index name
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ser = Series([1, 2, 3])
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ser.index.name = "foo"
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ser.index += 1
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assert ser.index.name == "foo"
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ser.index -= 1
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assert ser.index.name == "foo"
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def test_add_string(self):
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# from bug report
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index = pd.Index(["a", "b", "c"])
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index2 = index + "foo"
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assert "a" not in index2
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assert "afoo" in index2
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def test_iadd_string(self):
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index = pd.Index(["a", "b", "c"])
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# doesn't fail test unless there is a check before `+=`
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assert "a" in index
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index += "_x"
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assert "a_x" in index
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def test_add(self):
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index = tm.makeStringIndex(100)
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expected = pd.Index(index.values * 2)
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tm.assert_index_equal(index + index, expected)
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tm.assert_index_equal(index + index.tolist(), expected)
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tm.assert_index_equal(index.tolist() + index, expected)
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# test add and radd
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index = pd.Index(list("abc"))
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expected = pd.Index(["a1", "b1", "c1"])
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tm.assert_index_equal(index + "1", expected)
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expected = pd.Index(["1a", "1b", "1c"])
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tm.assert_index_equal("1" + index, expected)
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def test_sub_fail(self):
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index = tm.makeStringIndex(100)
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msg = "unsupported operand type|Cannot broadcast"
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with pytest.raises(TypeError, match=msg):
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index - "a"
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with pytest.raises(TypeError, match=msg):
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index - index
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with pytest.raises(TypeError, match=msg):
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index - index.tolist()
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with pytest.raises(TypeError, match=msg):
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index.tolist() - index
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def test_sub_object(self):
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# GH#19369
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index = pd.Index([Decimal(1), Decimal(2)])
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expected = pd.Index([Decimal(0), Decimal(1)])
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result = index - Decimal(1)
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tm.assert_index_equal(result, expected)
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result = index - pd.Index([Decimal(1), Decimal(1)])
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tm.assert_index_equal(result, expected)
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msg = "unsupported operand type"
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with pytest.raises(TypeError, match=msg):
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index - "foo"
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with pytest.raises(TypeError, match=msg):
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index - np.array([2, "foo"], dtype=object)
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def test_rsub_object(self, fixed_now_ts):
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# GH#19369
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index = pd.Index([Decimal(1), Decimal(2)])
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expected = pd.Index([Decimal(1), Decimal(0)])
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result = Decimal(2) - index
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tm.assert_index_equal(result, expected)
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result = np.array([Decimal(2), Decimal(2)]) - index
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tm.assert_index_equal(result, expected)
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msg = "unsupported operand type"
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with pytest.raises(TypeError, match=msg):
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"foo" - index
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with pytest.raises(TypeError, match=msg):
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np.array([True, fixed_now_ts]) - index
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class MyIndex(pd.Index):
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# Simple index subclass that tracks ops calls.
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_calls: int
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@classmethod
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def _simple_new(cls, values, name=None, dtype=None):
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result = object.__new__(cls)
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result._data = values
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result._name = name
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result._calls = 0
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result._reset_identity()
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return result
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def __add__(self, other):
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self._calls += 1
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return self._simple_new(self._data)
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def __radd__(self, other):
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return self.__add__(other)
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@pytest.mark.parametrize(
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"other",
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[
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[datetime.timedelta(1), datetime.timedelta(2)],
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[datetime.datetime(2000, 1, 1), datetime.datetime(2000, 1, 2)],
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[pd.Period("2000"), pd.Period("2001")],
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["a", "b"],
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],
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ids=["timedelta", "datetime", "period", "object"],
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)
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def test_index_ops_defer_to_unknown_subclasses(other):
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# https://github.com/pandas-dev/pandas/issues/31109
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values = np.array(
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[datetime.date(2000, 1, 1), datetime.date(2000, 1, 2)], dtype=object
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)
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a = MyIndex._simple_new(values)
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other = pd.Index(other)
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result = other + a
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assert isinstance(result, MyIndex)
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assert a._calls == 1
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