Closed
Description
Hi,
I found a bug in version 0.14, which has since been fixed in 0.15. I thought I'd report it because I couldn't find a mention of it and it might have been fixed silently. Also I couldn't find a specific test for this bug (as far as I could see).
Here is a test that fails with the bug:
import pandas as pd
print(pd.version.version)
def test_multiindex_repeat():
idx = pd.Index([1, 2, 3, 4])
m_idx = pd.MultiIndex.from_tuples([(1, 2), (3, 4),
(5, 6), (7, 8)])
data = ['a', 'b', 'c', 'd']
df = pd.Series(data, index=idx)
m_df = pd.Series(data, index=m_idx)
assert df.repeat(3).shape == (3 * len(data),)
assert m_df.repeat(3).shape == (3 * len(data),)
test_multiindex_repeat()With pandas 0.14, here is the backtrace:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-11-7fcd65f0e025> in <module>()
----> 1 assert m_df.repeat(3).shape == (3 * len(data),)
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/series.pyc in repeat(self, reps)
705 new_values = self.values.repeat(reps)
706 return self._constructor(new_values,
--> 707 index=new_index).__finalize__(self)
708
709 def reshape(self, *args, **kwargs):
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/series.pyc in __init__(self, data, index, dtype, name, copy, fastpath)
229 raise_cast_failure=True)
230
--> 231 data = SingleBlockManager(data, index, fastpath=True)
232
233 generic.NDFrame.__init__(self, data, fastpath=True)
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/internals.pyc in __init__(self, block, axis, do_integrity_check, fastpath)
3028 block = make_block(block,
3029 placement=slice(0, len(axis)),
-> 3030 ndim=1, fastpath=True)
3031
3032 self.blocks = [block]
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/internals.pyc in make_block(values, placement, klass, ndim, dtype, fastpath)
1835
1836 return klass(values, ndim=ndim, fastpath=fastpath,
-> 1837 placement=placement)
1838
1839
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/internals.pyc in __init__(self, values, ndim, fastpath, placement)
1231 super(ObjectBlock, self).__init__(values, ndim=ndim,
1232 fastpath=fastpath,
-> 1233 placement=placement)
1234
1235 @property
/home/guillaume/anaconda/envs/pelican/lib/python2.7/site-packages/pandas/core/internals.pyc in __init__(self, values, placement, ndim, fastpath)
72 raise ValueError('Wrong number of items passed %d,'
73 ' placement implies %d' % (
---> 74 len(self.values), len(self.mgr_locs)))
75
76 @property
ValueError: Wrong number of items passed 12, placement implies 4
Shall I make a PR adding this test to test_multiindex or is it not worth the (minimal) work?