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TST: Add test of assignment chaining and dupe cols #23487

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Nov 5, 2018
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TST: Add test of assignment chaining and dupe cols #23487

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23 changes: 17 additions & 6 deletions pandas/tests/indexing/test_chaining_and_caching.py
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Original file line number Diff line number Diff line change
Expand Up @@ -337,13 +337,24 @@ def f():
df2['y'] = ['g', 'h', 'i']

def test_detect_chained_assignment_warnings(self):
with option_context("chained_assignment", "warn"):
df = DataFrame({"A": ["aaa", "bbb", "ccc"], "B": [1, 2, 3]})

# warnings
with option_context('chained_assignment', 'warn'):
df = DataFrame({'A': ['aaa', 'bbb', 'ccc'], 'B': [1, 2, 3]})
with tm.assert_produces_warning(
expected_warning=com.SettingWithCopyWarning):
df.loc[0]['A'] = 111
with tm.assert_produces_warning(com.SettingWithCopyWarning):
df.loc[0]["A"] = 111

def test_detect_chained_assignment_warnings_filter_and_dupe_cols(self):
# xref gh-13017.
with option_context("chained_assignment", "warn"):
df = pd.DataFrame([[1, 2, 3], [4, 5, 6], [7, 8, -9]],
columns=["a", "a", "c"])

with tm.assert_produces_warning(com.SettingWithCopyWarning):
df.c.loc[df.c > 0] = None

expected = pd.DataFrame([[1, 2, 3], [4, 5, 6], [7, 8, -9]],
columns=["a", "a", "c"])
tm.assert_frame_equal(df, expected)

def test_chained_getitem_with_lists(self):

Expand Down