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 = Int64Index([1, 2, 8, 9], name="foo")
tm.assert_index_equal(result, expected)
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 = Int64Index([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14])
tm.assert_index_equal(result, expected)
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 = Int64Index([1, 2, 7, 8, 9], name="foo")
tm.assert_index_equal(result, expected)
def test_difference_mismatched_step(self):
obj = RangeIndex.from_range(range(1, 10), name="foo")
result = obj.difference(obj[::2])
expected = Int64Index(obj[1::2]._values, name=obj.name)
tm.assert_index_equal(result, expected, exact=True)
result = obj.difference(obj[1::2])
expected = Int64Index(obj[::2]._values, name=obj.name)
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)