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test_union_categoricals.py
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test_union_categoricals.py
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import pytest
import numpy as np
import pandas as pd
from pandas import Categorical, Series, CategoricalIndex
from pandas.core.dtypes.concat import union_categoricals
from pandas.util import testing as tm
class TestUnionCategoricals(object):
def test_union_categorical(self):
# GH 13361
data = [
(list('abc'), list('abd'), list('abcabd')),
([0, 1, 2], [2, 3, 4], [0, 1, 2, 2, 3, 4]),
([0, 1.2, 2], [2, 3.4, 4], [0, 1.2, 2, 2, 3.4, 4]),
(['b', 'b', np.nan, 'a'], ['a', np.nan, 'c'],
['b', 'b', np.nan, 'a', 'a', np.nan, 'c']),
(pd.date_range('2014-01-01', '2014-01-05'),
pd.date_range('2014-01-06', '2014-01-07'),
pd.date_range('2014-01-01', '2014-01-07')),
(pd.date_range('2014-01-01', '2014-01-05', tz='US/Central'),
pd.date_range('2014-01-06', '2014-01-07', tz='US/Central'),
pd.date_range('2014-01-01', '2014-01-07', tz='US/Central')),
(pd.period_range('2014-01-01', '2014-01-05'),
pd.period_range('2014-01-06', '2014-01-07'),
pd.period_range('2014-01-01', '2014-01-07')),
]
for a, b, combined in data:
for box in [Categorical, CategoricalIndex, Series]:
result = union_categoricals([box(Categorical(a)),
box(Categorical(b))])
expected = Categorical(combined)
tm.assert_categorical_equal(result, expected,
check_category_order=True)
# new categories ordered by appearance
s = Categorical(['x', 'y', 'z'])
s2 = Categorical(['a', 'b', 'c'])
result = union_categoricals([s, s2])
expected = Categorical(['x', 'y', 'z', 'a', 'b', 'c'],
categories=['x', 'y', 'z', 'a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
s = Categorical([0, 1.2, 2], ordered=True)
s2 = Categorical([0, 1.2, 2], ordered=True)
result = union_categoricals([s, s2])
expected = Categorical([0, 1.2, 2, 0, 1.2, 2], ordered=True)
tm.assert_categorical_equal(result, expected)
# must exactly match types
s = Categorical([0, 1.2, 2])
s2 = Categorical([2, 3, 4])
msg = 'dtype of categories must be the same'
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([s, s2])
msg = 'No Categoricals to union'
with tm.assert_raises_regex(ValueError, msg):
union_categoricals([])
def test_union_categoricals_nan(self):
# GH 13759
res = union_categoricals([pd.Categorical([1, 2, np.nan]),
pd.Categorical([3, 2, np.nan])])
exp = Categorical([1, 2, np.nan, 3, 2, np.nan])
tm.assert_categorical_equal(res, exp)
res = union_categoricals([pd.Categorical(['A', 'B']),
pd.Categorical(['B', 'B', np.nan])])
exp = Categorical(['A', 'B', 'B', 'B', np.nan])
tm.assert_categorical_equal(res, exp)
val1 = [pd.Timestamp('2011-01-01'), pd.Timestamp('2011-03-01'),
pd.NaT]
val2 = [pd.NaT, pd.Timestamp('2011-01-01'),
pd.Timestamp('2011-02-01')]
res = union_categoricals([pd.Categorical(val1), pd.Categorical(val2)])
exp = Categorical(val1 + val2,
categories=[pd.Timestamp('2011-01-01'),
pd.Timestamp('2011-03-01'),
pd.Timestamp('2011-02-01')])
tm.assert_categorical_equal(res, exp)
# all NaN
res = union_categoricals([pd.Categorical(np.array([np.nan, np.nan],
dtype=object)),
pd.Categorical(['X'])])
exp = Categorical([np.nan, np.nan, 'X'])
tm.assert_categorical_equal(res, exp)
res = union_categoricals([pd.Categorical([np.nan, np.nan]),
pd.Categorical([np.nan, np.nan])])
exp = Categorical([np.nan, np.nan, np.nan, np.nan])
tm.assert_categorical_equal(res, exp)
def test_union_categoricals_empty(self):
# GH 13759
res = union_categoricals([pd.Categorical([]),
pd.Categorical([])])
exp = Categorical([])
tm.assert_categorical_equal(res, exp)
res = union_categoricals([Categorical([]),
Categorical(['1'])])
exp = Categorical(['1'])
tm.assert_categorical_equal(res, exp)
def test_union_categorical_same_category(self):
# check fastpath
c1 = Categorical([1, 2, 3, 4], categories=[1, 2, 3, 4])
c2 = Categorical([3, 2, 1, np.nan], categories=[1, 2, 3, 4])
res = union_categoricals([c1, c2])
exp = Categorical([1, 2, 3, 4, 3, 2, 1, np.nan],
categories=[1, 2, 3, 4])
tm.assert_categorical_equal(res, exp)
c1 = Categorical(['z', 'z', 'z'], categories=['x', 'y', 'z'])
c2 = Categorical(['x', 'x', 'x'], categories=['x', 'y', 'z'])
res = union_categoricals([c1, c2])
exp = Categorical(['z', 'z', 'z', 'x', 'x', 'x'],
categories=['x', 'y', 'z'])
tm.assert_categorical_equal(res, exp)
def test_union_categorical_same_categories_different_order(self):
# https://github.com/pandas-dev/pandas/issues/19096
c1 = Categorical(['a', 'b', 'c'], categories=['a', 'b', 'c'])
c2 = Categorical(['a', 'b', 'c'], categories=['b', 'a', 'c'])
result = union_categoricals([c1, c2])
expected = Categorical(['a', 'b', 'c', 'a', 'b', 'c'],
categories=['a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
def test_union_categoricals_ordered(self):
c1 = Categorical([1, 2, 3], ordered=True)
c2 = Categorical([1, 2, 3], ordered=False)
msg = 'Categorical.ordered must be the same'
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([c1, c2])
res = union_categoricals([c1, c1])
exp = Categorical([1, 2, 3, 1, 2, 3], ordered=True)
tm.assert_categorical_equal(res, exp)
c1 = Categorical([1, 2, 3, np.nan], ordered=True)
c2 = Categorical([3, 2], categories=[1, 2, 3], ordered=True)
res = union_categoricals([c1, c2])
exp = Categorical([1, 2, 3, np.nan, 3, 2], ordered=True)
tm.assert_categorical_equal(res, exp)
c1 = Categorical([1, 2, 3], ordered=True)
c2 = Categorical([1, 2, 3], categories=[3, 2, 1], ordered=True)
msg = "to union ordered Categoricals, all categories must be the same"
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([c1, c2])
def test_union_categoricals_ignore_order(self):
# GH 15219
c1 = Categorical([1, 2, 3], ordered=True)
c2 = Categorical([1, 2, 3], ordered=False)
res = union_categoricals([c1, c2], ignore_order=True)
exp = Categorical([1, 2, 3, 1, 2, 3])
tm.assert_categorical_equal(res, exp)
msg = 'Categorical.ordered must be the same'
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([c1, c2], ignore_order=False)
res = union_categoricals([c1, c1], ignore_order=True)
exp = Categorical([1, 2, 3, 1, 2, 3])
tm.assert_categorical_equal(res, exp)
res = union_categoricals([c1, c1], ignore_order=False)
exp = Categorical([1, 2, 3, 1, 2, 3],
categories=[1, 2, 3], ordered=True)
tm.assert_categorical_equal(res, exp)
c1 = Categorical([1, 2, 3, np.nan], ordered=True)
c2 = Categorical([3, 2], categories=[1, 2, 3], ordered=True)
res = union_categoricals([c1, c2], ignore_order=True)
exp = Categorical([1, 2, 3, np.nan, 3, 2])
tm.assert_categorical_equal(res, exp)
c1 = Categorical([1, 2, 3], ordered=True)
c2 = Categorical([1, 2, 3], categories=[3, 2, 1], ordered=True)
res = union_categoricals([c1, c2], ignore_order=True)
exp = Categorical([1, 2, 3, 1, 2, 3])
tm.assert_categorical_equal(res, exp)
res = union_categoricals([c2, c1], ignore_order=True,
sort_categories=True)
exp = Categorical([1, 2, 3, 1, 2, 3], categories=[1, 2, 3])
tm.assert_categorical_equal(res, exp)
c1 = Categorical([1, 2, 3], ordered=True)
c2 = Categorical([4, 5, 6], ordered=True)
result = union_categoricals([c1, c2], ignore_order=True)
expected = Categorical([1, 2, 3, 4, 5, 6])
tm.assert_categorical_equal(result, expected)
msg = "to union ordered Categoricals, all categories must be the same"
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([c1, c2], ignore_order=False)
with tm.assert_raises_regex(TypeError, msg):
union_categoricals([c1, c2])
def test_union_categoricals_sort(self):
# GH 13846
c1 = Categorical(['x', 'y', 'z'])
c2 = Categorical(['a', 'b', 'c'])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical(['x', 'y', 'z', 'a', 'b', 'c'],
categories=['a', 'b', 'c', 'x', 'y', 'z'])
tm.assert_categorical_equal(result, expected)
# fastpath
c1 = Categorical(['a', 'b'], categories=['b', 'a', 'c'])
c2 = Categorical(['b', 'c'], categories=['b', 'a', 'c'])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical(['a', 'b', 'b', 'c'],
categories=['a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
c1 = Categorical(['a', 'b'], categories=['c', 'a', 'b'])
c2 = Categorical(['b', 'c'], categories=['c', 'a', 'b'])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical(['a', 'b', 'b', 'c'],
categories=['a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
# fastpath - skip resort
c1 = Categorical(['a', 'b'], categories=['a', 'b', 'c'])
c2 = Categorical(['b', 'c'], categories=['a', 'b', 'c'])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical(['a', 'b', 'b', 'c'],
categories=['a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
c1 = Categorical(['x', np.nan])
c2 = Categorical([np.nan, 'b'])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical(['x', np.nan, np.nan, 'b'],
categories=['b', 'x'])
tm.assert_categorical_equal(result, expected)
c1 = Categorical([np.nan])
c2 = Categorical([np.nan])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical([np.nan, np.nan])
tm.assert_categorical_equal(result, expected)
c1 = Categorical([])
c2 = Categorical([])
result = union_categoricals([c1, c2], sort_categories=True)
expected = Categorical([])
tm.assert_categorical_equal(result, expected)
c1 = Categorical(['b', 'a'], categories=['b', 'a', 'c'], ordered=True)
c2 = Categorical(['a', 'c'], categories=['b', 'a', 'c'], ordered=True)
with pytest.raises(TypeError):
union_categoricals([c1, c2], sort_categories=True)
def test_union_categoricals_sort_false(self):
# GH 13846
c1 = Categorical(['x', 'y', 'z'])
c2 = Categorical(['a', 'b', 'c'])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical(['x', 'y', 'z', 'a', 'b', 'c'],
categories=['x', 'y', 'z', 'a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
# fastpath
c1 = Categorical(['a', 'b'], categories=['b', 'a', 'c'])
c2 = Categorical(['b', 'c'], categories=['b', 'a', 'c'])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical(['a', 'b', 'b', 'c'],
categories=['b', 'a', 'c'])
tm.assert_categorical_equal(result, expected)
# fastpath - skip resort
c1 = Categorical(['a', 'b'], categories=['a', 'b', 'c'])
c2 = Categorical(['b', 'c'], categories=['a', 'b', 'c'])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical(['a', 'b', 'b', 'c'],
categories=['a', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
c1 = Categorical(['x', np.nan])
c2 = Categorical([np.nan, 'b'])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical(['x', np.nan, np.nan, 'b'],
categories=['x', 'b'])
tm.assert_categorical_equal(result, expected)
c1 = Categorical([np.nan])
c2 = Categorical([np.nan])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical([np.nan, np.nan])
tm.assert_categorical_equal(result, expected)
c1 = Categorical([])
c2 = Categorical([])
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical([])
tm.assert_categorical_equal(result, expected)
c1 = Categorical(['b', 'a'], categories=['b', 'a', 'c'], ordered=True)
c2 = Categorical(['a', 'c'], categories=['b', 'a', 'c'], ordered=True)
result = union_categoricals([c1, c2], sort_categories=False)
expected = Categorical(['b', 'a', 'a', 'c'],
categories=['b', 'a', 'c'], ordered=True)
tm.assert_categorical_equal(result, expected)
def test_union_categorical_unwrap(self):
# GH 14173
c1 = Categorical(['a', 'b'])
c2 = pd.Series(['b', 'c'], dtype='category')
result = union_categoricals([c1, c2])
expected = Categorical(['a', 'b', 'b', 'c'])
tm.assert_categorical_equal(result, expected)
c2 = CategoricalIndex(c2)
result = union_categoricals([c1, c2])
tm.assert_categorical_equal(result, expected)
c1 = Series(c1)
result = union_categoricals([c1, c2])
tm.assert_categorical_equal(result, expected)
with pytest.raises(TypeError):
union_categoricals([c1, ['a', 'b', 'c']])