def dicttuple(typename, field_names, **kwargs)

dicttuple.py

def dicttuple(typename, field_names, **kwargs):
    "Create a namedtuple that can be used like a dict in **keyword expansion."
    from itertools import count, izip
    from collections import namedtuple
    t = namedtuple(typename, field_names, **kwargs)
    t._index = dict(izip(t._fields, count()))
    t.keys = lambda self: self._fields
    t.keys.__doc__ = "List of tuple element names."
    f = t.__getitem__
    t.__getitem__ = lambda sf,i: sf[sf._index[i]] if isstring(i) else f(sf, i)
    t.__getitem__.__doc__ = \
        "x[i]  Get tuple element named i if i is string, else get i'th element."
    return t