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API/REGRESS: partial revert of f8b6208675b5b10d73a74f50478fa5e37b43fc02 (GH5720,GH5744) #5747

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Merged
merged 1 commit into from
Dec 19, 2013
Merged

API/REGRESS: partial revert of f8b6208675b5b10d73a74f50478fa5e37b43fc02 (GH5720,GH5744) #5747

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7 changes: 4 additions & 3 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1916,10 +1916,11 @@ def _ensure_valid_index(self, value):
'Series')
self._data.set_axis(1, value.index.copy(), check_axis=False)

# we are a scalar
# noop
else:
raise ValueError('Cannot set a frame with no defined index '
'and a value that cannot be converted to a '
'Series')

pass

def _set_item(self, key, value):
"""
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10 changes: 4 additions & 6 deletions pandas/tests/test_indexing.py
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Expand Up @@ -1778,14 +1778,12 @@ def f():
# don't create rows when empty
df = DataFrame({"A": [1, 2, 3], "B": [1.2, 4.2, 5.2]})
y = df[df.A > 5]
def f():
y['New'] = np.nan
self.assertRaises(ValueError, f)
y['New'] = np.nan
assert_frame_equal(y,DataFrame(columns=['A','B','New']))

df = DataFrame(columns=['a', 'b', 'c c'])
def f():
df['d'] = 3
self.assertRaises(ValueError, f)
df['d'] = 3
assert_frame_equal(df,DataFrame(columns=['a','b','c c','d']))
assert_series_equal(df['c c'],Series(name='c c',dtype=object))

# reindex columns is ok
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