Index.str.partition's behaviour changed in 3ab35b4 in a backwards incompatible way which doesn't seem intentional.
python3 -c 'import pandas; pandas.Index(["a,b", "c,d"], name="hello").str.partition(",")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/pwaller/.local/src/pandas/pandas/core/strings.py", line 1432, in partition
return self._wrap_result(result, expand=expand)
File "/home/pwaller/.local/src/pandas/pandas/core/strings.py", line 1348, in _wrap_result
return MultiIndex.from_tuples(result, names=name)
File "/home/pwaller/.local/src/pandas/pandas/indexes/multi.py", line 889, in from_tuples
return MultiIndex.from_arrays(arrays, sortorder=sortorder, names=names)
File "/home/pwaller/.local/src/pandas/pandas/indexes/multi.py", line 844, in from_arrays
names=names, verify_integrity=False)
File "/home/pwaller/.local/src/pandas/pandas/indexes/multi.py", line 92, in __new__
result._set_names(names)
File "/home/pwaller/.local/src/pandas/pandas/indexes/multi.py", line 446, in _set_names
raise ValueError('Length of names must match number of levels in '
ValueError: Length of names must match number of levels in MultiIndex. Expected Output
In [1]: import pandas; pandas.Index(["a,b", "c,d"], name="hello").str.partition(",")
Out[1]:
MultiIndex(levels=[['a', 'c'], [','], ['b', 'd']],
labels=[[0, 1], [0, 0], [0, 1]]) Versions
I bisected the problem to 3ab35b4 (cc @sinhrks). The problem is not present in 0.17.1 and is present in 0.18.0rc2.
Note: when I use a name="foo", it happens to work because it has the correct length, the index name ends up being ["f", "o", "o"], so it's possible this is tested somewhere and happens to work even though it's not correct for a large number of use cases.
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