Panel arguments can no longer be named.
This code used to work some time around version 0.10, but now generates a ValueError:

In [14]: y
Out[14]: 
<class 'pandas.core.panel.Panel'>
Dimensions: 2 (items) x 3 (major_axis) x 2 (minor_axis)
Items axis: z1 to z2
Major_axis axis: 0 to 2
Minor_axis axis: a to b

In [15]: y.transpose('minor', 'major', 'items')
Out[15]: 
<class 'pandas.core.panel.Panel'>
Dimensions: 2 (items) x 3 (major_axis) x 2 (minor_axis)
Items axis: a to b
Major_axis axis: 0 to 2
Minor_axis axis: z1 to z2
## In [16]: y.transpose( items='minor', major='major', minor='items')

ValueError                                Traceback (most recent call last)
<ipython-input-16-00ebdc16128e> in <module>()
----> 1 y.transpose( items='minor', major='major', minor='items')

/usr/local/lib/python2.7/dist-packages/pandas-0.12.0.dev_be25266-py2.7-linux-x86_64.egg/pandas/core/panel.pyc in transpose(self, _args, *_kwargs)
   1176                 except (IndexError):
   1177                     raise ValueError(
-> 1178                         "not enough arguments specified to transpose!")
   1179 
   1180         axes = [self._get_axis_number(kwargs[a]) for a in self._AXIS_ORDERS]

ValueError: not enough arguments specified to transpose!
