gistfile1.py

In [7]: class Custom(Record):
   ...:     max = int32
   ...:     min = int32
   ...:     @derived
   ...:     def mid(self):
   ...:         return (self.min + self.max)/2
   ...:     

In [8]: Custom
Out[8]: __main__.Custom

In [9]: type(Custom)
Out[9]: blaze.datashape.record.DeclMeta

In [10]: print Custom
<class '__main__.Custom'>

In [11]: a = Table([(5,10), (12,24), (20,24)], Custom)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-11-5f74679e3d45> in <module>()
----> 1 a = Table([(5,10), (12,24), (20,24)], Custom)

/Users/pwang/continuum/src/blaze-core/blaze/table.pyc in __init__(self, data, dshape, metadata, layout, params)
    451             self.data = CTableSource(data, dshape=dshape, params=params)
    452             # Pull the labels from the datashape
--> 453             self._axes = self._datashape[-1].names
    454         else:
    455             raise ValueError

TypeError: 'DeclMeta' object does not support indexing