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In Python 3.4.1 installed with Anaconda. I tried the following
(expecting an OrderedDict as result):
>>>from collections import namedtuple
>>>NT = namedtuple("NT",["a","b"])
>>>nt = NT(1,2)
>>>print(vars(nt))
{}
so the result is an empty dict. In Python 3.3.2 (downgraded in the
same Anaconda environment) results in:
>>>print(vars(nt))
OrderedDict([('a', 1), ('b', 2)])

> so the result is an empty dict.
It works fine for me in the standard distribution:
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 00:54:21) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> from collections import namedtuple
>>> NT = namedtuple("NT",["a","b"])
>>> nt = NT(1,2)
>>> print(vars(nt))
OrderedDict([('a', 1), ('b', 2)])
There may be something amiss with the Anaconda distribution. I suggest reporting this to Continuum IO (the producers of that distribution).

Thanks, I'll report it to Continuum IO.