Slicing single row of XDataFrame does not work

[mloning]

Slicing of single row in XDataFrame does not work, probably because it tries to return a series which does not work as types are heterogeneous, so instead one may want to return a XDataFrame with a single row.

import pandas as pd
from xpandas.data_container import XDataFrame

iris = pd.read_csv('https://raw.githubusercontent.com/mwaskom/seaborn-data/master/iris.csv')
iris.iloc[0] # works

irisx = XDataFrame(iris) 
irisx.iloc[0] # breaks

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-32-b46ce52f9af0> in <module>
----> 1 irisx.iloc[0]

~/.conda/envs/sktime/lib/python3.7/site-packages/pandas/core/indexing.py in __getitem__(self, key)
   1476 
   1477             maybe_callable = com._apply_if_callable(key, self.obj)
-> 1478             return self._getitem_axis(maybe_callable, axis=axis)
   1479 
   1480     def _is_scalar_access(self, key):

~/.conda/envs/sktime/lib/python3.7/site-packages/pandas/core/indexing.py in _getitem_axis(self, key, axis)
   2102             self._validate_integer(key, axis)
   2103 
-> 2104             return self._get_loc(key, axis=axis)
   2105 
   2106     def _convert_to_indexer(self, obj, axis=None, is_setter=False):

~/.conda/envs/sktime/lib/python3.7/site-packages/pandas/core/indexing.py in _get_loc(self, key, axis)
    143         if axis is None:
    144             axis = self.axis
--> 145         return self.obj._ixs(key, axis=axis)
    146 
    147     def _slice(self, obj, axis=None, kind=None):

~/.conda/envs/sktime/lib/python3.7/site-packages/pandas/core/frame.py in _ixs(self, i, axis)
   2624                                                       index=self.columns,
   2625                                                       name=self.index[i],
-> 2626                                                       dtype=new_values.dtype)
   2627                 result._set_is_copy(self, copy=copy)
   2628                 return result

~/.conda/envs/sktime/lib/python3.7/site-packages/xpandas/data_container/data_container.py in __init__(self, *args, **kwargs)
     71         check_result, data_type = _check_all_elements_have_the_same_property(data, type)
     72         if not check_result:
---> 73             raise ValueError('Not all elements the same type')
     74 
     75         if data_type is not None:

ValueError: Not all elements the same type