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ERR: add stacklevel to to_dict() UserWarning (#16927) #16936

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merged 4 commits into from
Jul 15, 2017
Merged

ERR: add stacklevel to to_dict() UserWarning (#16927) #16936

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f0985d2
ERR: add stacklevel to to_dict() UserWarning (#16927)
alanbato Jul 15, 2017
f6a7179
TST: Add warning testing to to_dict()
alanbato Jul 15, 2017
d00e6fd
Fix warning assertion on to_dict() test
alanbato Jul 15, 2017
96cc9ba
Add github issue to documentation on to_dict() warning test
alanbato Jul 15, 2017
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3 changes: 2 additions & 1 deletion pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -972,7 +972,8 @@ def to_dict(self, orient='dict', into=dict):
"""
if not self.columns.is_unique:
warnings.warn("DataFrame columns are not unique, some "
"columns will be omitted.", UserWarning)
"columns will be omitted.", UserWarning,
stacklevel=2)
# GH16122
into_c = standardize_mapping(into)
if orient.lower().startswith('d'):
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7 changes: 7 additions & 0 deletions pandas/tests/frame/test_convert_to.py
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Expand Up @@ -216,6 +216,13 @@ def test_to_dict_errors(self, mapping):
with pytest.raises(TypeError):
df.to_dict(into=mapping)

def test_to_dict_not_unique_warning(self):
# GH16927: When converting to a dict, if a column has a non-unique name
# it will be dropped, throwing a warning.
df = DataFrame([[1, 2, 3]], columns=['a', 'a', 'b'])
with tm.assert_produces_warning(UserWarning):
df.to_dict()

@pytest.mark.parametrize('tz', ['UTC', 'GMT', 'US/Eastern'])
def test_to_records_datetimeindex_with_tz(self, tz):
# GH13937
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