> Would it be worth adding an example of unpacking such as,
> t(**a._asdict()), or something similar to the documentation ?

There are a myriad of uses for dictionaries and the namedtuple docs don't seem like to right place to cover them (**unpacking, str.format_map, str.__mod__, etc).  Even the dict and OrderedDict docs don't cover these.

Also, the use of somefunc(**nt._asdict()) isn't a common pattern.  A requirement for **unpacking tends to nudge design choices towards an actual mapping rather than a tuple or tuple subclass for the underlying data store.  That is likely why this hasn't come-up before.