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REF: test_mutate_columns -> test_setitem #33193

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Merged
merged 2 commits into from
Apr 1, 2020
Merged

REF: test_mutate_columns -> test_setitem #33193

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0e96f37
rename --> test_setitem
jbrockmendel Apr 1, 2020
bab331d
CLN: construct more directly
jbrockmendel Apr 1, 2020
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17 changes: 10 additions & 7 deletions pandas/tests/frame/test_mutate_columns.py → pandas/tests/frame/indexing/test_setitem.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import numpy as np
import pytest

from pandas import DataFrame, Series
from pandas import DataFrame, Index, Series
import pandas._testing as tm

# Column add, remove, delete.
Expand All @@ -12,14 +12,17 @@ def test_setitem_error_msmgs(self):

# GH 7432
df = DataFrame(
{"foo": ["a", "b", "c"], "bar": [1, 2, 3], "baz": ["d", "e", "f"]}
).set_index("foo")
s = DataFrame(
{"foo": ["a", "b", "c", "a"], "fiz": ["g", "h", "i", "j"]}
).set_index("foo")
{"bar": [1, 2, 3], "baz": ["d", "e", "f"]},
index=Index(["a", "b", "c"], name="foo"),
)
ser = Series(
["g", "h", "i", "j"],
index=Index(["a", "b", "c", "a"], name="foo"),
name="fiz",
)
msg = "cannot reindex from a duplicate axis"
with pytest.raises(ValueError, match=msg):
df["newcol"] = s
df["newcol"] = ser

# GH 4107, more descriptive error message
df = DataFrame(np.random.randint(0, 2, (4, 4)), columns=["a", "b", "c", "d"])
Expand Down