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TST: add test for .loc indexing Index type preservation #29533

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Merged
merged 4 commits into from
Nov 13, 2019
Merged

TST: add test for .loc indexing Index type preservation #29533

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fc7e38a
add test for .loc indexing Index type preservation
ganevgv Nov 10, 2019
cda39a1
rename test
ganevgv Nov 10, 2019
3a87880
restrucure test
ganevgv Nov 11, 2019
2478ed8
move test to TestDataFrameIndexingCategorical class
ganevgv Nov 12, 2019
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23 changes: 23 additions & 0 deletions pandas/tests/frame/test_indexing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1944,6 +1944,29 @@ def test_set_value_resize(self, float_frame):
with pytest.raises(ValueError, match=msg):
res3._set_value("foobar", "baz", "sam")

def test_loc_indexing_preserves_index_dtype(self):
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Can you mention categorical in the title?

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Thanks, @mroeschke - done.

# GH 15166
df = DataFrame(
data=np.arange(2, 22, 2),
index=pd.MultiIndex(
levels=[pd.CategoricalIndex(["a", "b"]), range(10)],
codes=[[0] * 5 + [1] * 5, range(10)],
names=["Index1", "Index2"],
),
)

result_1 = df.index.levels[0]
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can you write this like

expected=

result=
tm.assert_index_equal....

result=
tm.assert_index_equal....

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Thanks, @jreback - done.

result_2 = df.loc[["a"]].index.levels[0]
expected = pd.CategoricalIndex(
["a", "b"],
categories=["a", "b"],
ordered=False,
name="Index1",
dtype="category",
)
tm.assert_index_equal(result_1, expected)
tm.assert_index_equal(result_2, expected)

def test_set_value_with_index_dtype_change(self):
df_orig = DataFrame(np.random.randn(3, 3), index=range(3), columns=list("ABC"))

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