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Add tests for usecols and index col combinations #44951

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Merged
jreback merged 1 commit into from
Dec 18, 2021
Merged

Add tests for usecols and index col combinations #44951

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22 changes: 22 additions & 0 deletions pandas/tests/io/parser/usecols/test_usecols_basic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,28 @@ def test_usecols_implicit_index_col(all_parsers):
tm.assert_frame_equal(result, expected)


def test_usecols_index_col_middle(all_parsers):
# GH#9098
parser = all_parsers
data = """a,b,c,d
1,2,3,4
"""
result = parser.read_csv(StringIO(data), usecols=["b", "c", "d"], index_col="c")
expected = DataFrame({"b": [2], "d": [4]}, index=Index([3], name="c"))
tm.assert_frame_equal(result, expected)


def test_usecols_index_col_end(all_parsers):
# GH#9098
parser = all_parsers
data = """a,b,c,d
1,2,3,4
"""
result = parser.read_csv(StringIO(data), usecols=["b", "c", "d"], index_col="d")
expected = DataFrame({"b": [2], "c": [3]}, index=Index([4], name="d"))
tm.assert_frame_equal(result, expected)


def test_usecols_regex_sep(all_parsers):
# see gh-2733
parser = all_parsers
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