Inzynierka/Lib/site-packages/pandas/tests/indexes/ranges/test_setops.py

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2023-06-02 12:51:02 +02:00
from datetime import (
datetime,
timedelta,
)
from hypothesis import (
assume,
given,
strategies as st,
)
import numpy as np
import pytest
from pandas import (
Index,
RangeIndex,
)
import pandas._testing as tm
class TestRangeIndexSetOps:
@pytest.mark.parametrize("dtype", [None, "int64", "uint64"])
def test_intersection_mismatched_dtype(self, dtype):
# check that we cast to float, not object
index = RangeIndex(start=0, stop=20, step=2, name="foo")
index = Index(index, dtype=dtype)
flt = index.astype(np.float64)
# bc index.equals(flt), we go through fastpath and get RangeIndex back
result = index.intersection(flt)
tm.assert_index_equal(result, index, exact=True)
result = flt.intersection(index)
tm.assert_index_equal(result, flt, exact=True)
# neither empty, not-equals
result = index.intersection(flt[1:])
tm.assert_index_equal(result, flt[1:], exact=True)
result = flt[1:].intersection(index)
tm.assert_index_equal(result, flt[1:], exact=True)
# empty other
result = index.intersection(flt[:0])
tm.assert_index_equal(result, flt[:0], exact=True)
result = flt[:0].intersection(index)
tm.assert_index_equal(result, flt[:0], exact=True)
def test_intersection_empty(self, sort, names):
# name retention on empty intersections
index = RangeIndex(start=0, stop=20, step=2, name=names[0])
# empty other
result = index.intersection(index[:0].rename(names[1]), sort=sort)
tm.assert_index_equal(result, index[:0].rename(names[2]), exact=True)
# empty self
result = index[:0].intersection(index.rename(names[1]), sort=sort)
tm.assert_index_equal(result, index[:0].rename(names[2]), exact=True)
def test_intersection(self, sort):
# intersect with Index with dtype int64
index = RangeIndex(start=0, stop=20, step=2)
other = Index(np.arange(1, 6))
result = index.intersection(other, sort=sort)
expected = Index(np.sort(np.intersect1d(index.values, other.values)))
tm.assert_index_equal(result, expected)
result = other.intersection(index, sort=sort)
expected = Index(
np.sort(np.asarray(np.intersect1d(index.values, other.values)))
)
tm.assert_index_equal(result, expected)
# intersect with increasing RangeIndex
other = RangeIndex(1, 6)
result = index.intersection(other, sort=sort)
expected = Index(np.sort(np.intersect1d(index.values, other.values)))
tm.assert_index_equal(result, expected, exact="equiv")
# intersect with decreasing RangeIndex
other = RangeIndex(5, 0, -1)
result = index.intersection(other, sort=sort)
expected = Index(np.sort(np.intersect1d(index.values, other.values)))
tm.assert_index_equal(result, expected, exact="equiv")
# reversed (GH 17296)
result = other.intersection(index, sort=sort)
tm.assert_index_equal(result, expected, exact="equiv")
# GH 17296: intersect two decreasing RangeIndexes
first = RangeIndex(10, -2, -2)
other = RangeIndex(5, -4, -1)
expected = first.astype(int).intersection(other.astype(int), sort=sort)
result = first.intersection(other, sort=sort).astype(int)
tm.assert_index_equal(result, expected)
# reversed
result = other.intersection(first, sort=sort).astype(int)
tm.assert_index_equal(result, expected)
index = RangeIndex(5, name="foo")
# intersect of non-overlapping indices
other = RangeIndex(5, 10, 1, name="foo")
result = index.intersection(other, sort=sort)
expected = RangeIndex(0, 0, 1, name="foo")
tm.assert_index_equal(result, expected)
other = RangeIndex(-1, -5, -1)
result = index.intersection(other, sort=sort)
expected = RangeIndex(0, 0, 1)
tm.assert_index_equal(result, expected)
# intersection of empty indices
other = RangeIndex(0, 0, 1)
result = index.intersection(other, sort=sort)
expected = RangeIndex(0, 0, 1)
tm.assert_index_equal(result, expected)
result = other.intersection(index, sort=sort)
tm.assert_index_equal(result, expected)
def test_intersection_non_overlapping_gcd(self, sort, names):
# intersection of non-overlapping values based on start value and gcd
index = RangeIndex(1, 10, 2, name=names[0])
other = RangeIndex(0, 10, 4, name=names[1])
result = index.intersection(other, sort=sort)
expected = RangeIndex(0, 0, 1, name=names[2])
tm.assert_index_equal(result, expected)
def test_union_noncomparable(self, sort):
# corner case, Index with non-int64 dtype
index = RangeIndex(start=0, stop=20, step=2)
other = Index([datetime.now() + timedelta(i) for i in range(4)], dtype=object)
result = index.union(other, sort=sort)
expected = Index(np.concatenate((index, other)))
tm.assert_index_equal(result, expected)
result = other.union(index, sort=sort)
expected = Index(np.concatenate((other, index)))
tm.assert_index_equal(result, expected)
@pytest.mark.parametrize(
"idx1, idx2, expected_sorted, expected_notsorted",
[
(
RangeIndex(0, 10, 1),
RangeIndex(0, 10, 1),
RangeIndex(0, 10, 1),
RangeIndex(0, 10, 1),
),
(
RangeIndex(0, 10, 1),
RangeIndex(5, 20, 1),
RangeIndex(0, 20, 1),
RangeIndex(0, 20, 1),
),
(
RangeIndex(0, 10, 1),
RangeIndex(10, 20, 1),
RangeIndex(0, 20, 1),
RangeIndex(0, 20, 1),
),
(
RangeIndex(0, -10, -1),
RangeIndex(0, -10, -1),
RangeIndex(0, -10, -1),
RangeIndex(0, -10, -1),
),
(
RangeIndex(0, -10, -1),
RangeIndex(-10, -20, -1),
RangeIndex(-19, 1, 1),
RangeIndex(0, -20, -1),
),
(
RangeIndex(0, 10, 2),
RangeIndex(1, 10, 2),
RangeIndex(0, 10, 1),
Index(list(range(0, 10, 2)) + list(range(1, 10, 2))),
),
(
RangeIndex(0, 11, 2),
RangeIndex(1, 12, 2),
RangeIndex(0, 12, 1),
Index(list(range(0, 11, 2)) + list(range(1, 12, 2))),
),
(
RangeIndex(0, 21, 4),
RangeIndex(-2, 24, 4),
RangeIndex(-2, 24, 2),
Index(list(range(0, 21, 4)) + list(range(-2, 24, 4))),
),
(
RangeIndex(0, -20, -2),
RangeIndex(-1, -21, -2),
RangeIndex(-19, 1, 1),
Index(list(range(0, -20, -2)) + list(range(-1, -21, -2))),
),
(
RangeIndex(0, 100, 5),
RangeIndex(0, 100, 20),
RangeIndex(0, 100, 5),
RangeIndex(0, 100, 5),
),
(
RangeIndex(0, -100, -5),
RangeIndex(5, -100, -20),
RangeIndex(-95, 10, 5),
Index(list(range(0, -100, -5)) + [5]),
),
(
RangeIndex(0, -11, -1),
RangeIndex(1, -12, -4),
RangeIndex(-11, 2, 1),
Index(list(range(0, -11, -1)) + [1, -11]),
),
(RangeIndex(0), RangeIndex(0), RangeIndex(0), RangeIndex(0)),
(
RangeIndex(0, -10, -2),
RangeIndex(0),
RangeIndex(0, -10, -2),
RangeIndex(0, -10, -2),
),
(
RangeIndex(0, 100, 2),
RangeIndex(100, 150, 200),
RangeIndex(0, 102, 2),
RangeIndex(0, 102, 2),
),
(
RangeIndex(0, -100, -2),
RangeIndex(-100, 50, 102),
RangeIndex(-100, 4, 2),
Index(list(range(0, -100, -2)) + [-100, 2]),
),
(
RangeIndex(0, -100, -1),
RangeIndex(0, -50, -3),
RangeIndex(-99, 1, 1),
RangeIndex(0, -100, -1),
),
(
RangeIndex(0, 1, 1),
RangeIndex(5, 6, 10),
RangeIndex(0, 6, 5),
RangeIndex(0, 10, 5),
),
(
RangeIndex(0, 10, 5),
RangeIndex(-5, -6, -20),
RangeIndex(-5, 10, 5),
Index([0, 5, -5]),
),
(
RangeIndex(0, 3, 1),
RangeIndex(4, 5, 1),
Index([0, 1, 2, 4]),
Index([0, 1, 2, 4]),
),
(
RangeIndex(0, 10, 1),
Index([], dtype=np.int64),
RangeIndex(0, 10, 1),
RangeIndex(0, 10, 1),
),
(
RangeIndex(0),
Index([1, 5, 6]),
Index([1, 5, 6]),
Index([1, 5, 6]),
),
# GH 43885
(
RangeIndex(0, 10),
RangeIndex(0, 5),
RangeIndex(0, 10),
RangeIndex(0, 10),
),
],
ids=lambda x: repr(x) if isinstance(x, RangeIndex) else x,
)
def test_union_sorted(self, idx1, idx2, expected_sorted, expected_notsorted):
res1 = idx1.union(idx2, sort=None)
tm.assert_index_equal(res1, expected_sorted, exact=True)
res1 = idx1.union(idx2, sort=False)
tm.assert_index_equal(res1, expected_notsorted, exact=True)
res2 = idx2.union(idx1, sort=None)
res3 = Index(idx1._values, name=idx1.name).union(idx2, sort=None)
tm.assert_index_equal(res2, expected_sorted, exact=True)
tm.assert_index_equal(res3, expected_sorted, exact="equiv")
def test_union_same_step_misaligned(self):
# GH#44019
left = RangeIndex(range(0, 20, 4))
right = RangeIndex(range(1, 21, 4))
result = left.union(right)
expected = Index([0, 1, 4, 5, 8, 9, 12, 13, 16, 17])
tm.assert_index_equal(result, expected, exact=True)
def test_difference(self):
# GH#12034 Cases where we operate against another RangeIndex and may
# get back another RangeIndex
obj = RangeIndex.from_range(range(1, 10), name="foo")
result = obj.difference(obj)
expected = RangeIndex.from_range(range(0), name="foo")
tm.assert_index_equal(result, expected, exact=True)
result = obj.difference(expected.rename("bar"))
tm.assert_index_equal(result, obj.rename(None), exact=True)
result = obj.difference(obj[:3])
tm.assert_index_equal(result, obj[3:], exact=True)
result = obj.difference(obj[-3:])
tm.assert_index_equal(result, obj[:-3], exact=True)
# Flipping the step of 'other' doesn't affect the result, but
# flipping the stepof 'self' does when sort=None
result = obj[::-1].difference(obj[-3:])
tm.assert_index_equal(result, obj[:-3], exact=True)
result = obj[::-1].difference(obj[-3:], sort=False)
tm.assert_index_equal(result, obj[:-3][::-1], exact=True)
result = obj[::-1].difference(obj[-3:][::-1])
tm.assert_index_equal(result, obj[:-3], exact=True)
result = obj[::-1].difference(obj[-3:][::-1], sort=False)
tm.assert_index_equal(result, obj[:-3][::-1], exact=True)
result = obj.difference(obj[2:6])
expected = Index([1, 2, 7, 8, 9], name="foo")
tm.assert_index_equal(result, expected, exact=True)
def test_difference_sort(self):
# GH#44085 ensure we respect the sort keyword
idx = Index(range(4))[::-1]
other = Index(range(3, 4))
result = idx.difference(other)
expected = Index(range(3))
tm.assert_index_equal(result, expected, exact=True)
result = idx.difference(other, sort=False)
expected = expected[::-1]
tm.assert_index_equal(result, expected, exact=True)
# case where the intersection is empty
other = range(10, 12)
result = idx.difference(other, sort=None)
expected = idx[::-1]
tm.assert_index_equal(result, expected, exact=True)
def test_difference_mismatched_step(self):
obj = RangeIndex.from_range(range(1, 10), name="foo")
result = obj.difference(obj[::2])
expected = obj[1::2]
tm.assert_index_equal(result, expected, exact=True)
result = obj[::-1].difference(obj[::2], sort=False)
tm.assert_index_equal(result, expected[::-1], exact=True)
result = obj.difference(obj[1::2])
expected = obj[::2]
tm.assert_index_equal(result, expected, exact=True)
result = obj[::-1].difference(obj[1::2], sort=False)
tm.assert_index_equal(result, expected[::-1], exact=True)
def test_difference_interior_overlap_endpoints_preserved(self):
left = RangeIndex(range(4))
right = RangeIndex(range(1, 3))
result = left.difference(right)
expected = RangeIndex(0, 4, 3)
assert expected.tolist() == [0, 3]
tm.assert_index_equal(result, expected, exact=True)
def test_difference_endpoints_overlap_interior_preserved(self):
left = RangeIndex(-8, 20, 7)
right = RangeIndex(13, -9, -3)
result = left.difference(right)
expected = RangeIndex(-1, 13, 7)
assert expected.tolist() == [-1, 6]
tm.assert_index_equal(result, expected, exact=True)
def test_difference_interior_non_preserving(self):
# case with intersection of length 1 but RangeIndex is not preserved
idx = Index(range(10))
other = idx[3:4]
result = idx.difference(other)
expected = Index([0, 1, 2, 4, 5, 6, 7, 8, 9])
tm.assert_index_equal(result, expected, exact=True)
# case with other.step / self.step > 2
other = idx[::3]
result = idx.difference(other)
expected = Index([1, 2, 4, 5, 7, 8])
tm.assert_index_equal(result, expected, exact=True)
# cases with only reaching one end of left
obj = Index(range(20))
other = obj[:10:2]
result = obj.difference(other)
expected = Index([1, 3, 5, 7, 9] + list(range(10, 20)))
tm.assert_index_equal(result, expected, exact=True)
other = obj[1:11:2]
result = obj.difference(other)
expected = Index([0, 2, 4, 6, 8, 10] + list(range(11, 20)))
tm.assert_index_equal(result, expected, exact=True)
def test_symmetric_difference(self):
# GH#12034 Cases where we operate against another RangeIndex and may
# get back another RangeIndex
left = RangeIndex.from_range(range(1, 10), name="foo")
result = left.symmetric_difference(left)
expected = RangeIndex.from_range(range(0), name="foo")
tm.assert_index_equal(result, expected)
result = left.symmetric_difference(expected.rename("bar"))
tm.assert_index_equal(result, left.rename(None))
result = left[:-2].symmetric_difference(left[2:])
expected = Index([1, 2, 8, 9], name="foo")
tm.assert_index_equal(result, expected, exact=True)
right = RangeIndex.from_range(range(10, 15))
result = left.symmetric_difference(right)
expected = RangeIndex.from_range(range(1, 15))
tm.assert_index_equal(result, expected)
result = left.symmetric_difference(right[1:])
expected = Index([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14])
tm.assert_index_equal(result, expected, exact=True)
def assert_range_or_not_is_rangelike(index):
"""
Check that we either have a RangeIndex or that this index *cannot*
be represented as a RangeIndex.
"""
if not isinstance(index, RangeIndex) and len(index) > 0:
diff = index[:-1] - index[1:]
assert not (diff == diff[0]).all()
@given(
st.integers(-20, 20),
st.integers(-20, 20),
st.integers(-20, 20),
st.integers(-20, 20),
st.integers(-20, 20),
st.integers(-20, 20),
)
def test_range_difference(start1, stop1, step1, start2, stop2, step2):
# test that
# a) we match Index[int64].difference and
# b) we return RangeIndex whenever it is possible to do so.
assume(step1 != 0)
assume(step2 != 0)
left = RangeIndex(start1, stop1, step1)
right = RangeIndex(start2, stop2, step2)
result = left.difference(right, sort=None)
assert_range_or_not_is_rangelike(result)
left_int64 = Index(left.to_numpy())
right_int64 = Index(right.to_numpy())
alt = left_int64.difference(right_int64, sort=None)
tm.assert_index_equal(result, alt, exact="equiv")
result = left.difference(right, sort=False)
assert_range_or_not_is_rangelike(result)
alt = left_int64.difference(right_int64, sort=False)
tm.assert_index_equal(result, alt, exact="equiv")