Differences creating tuples and collections.namedtuples

John Reid j.reid at mail.cryst.bbk.ac.uk
Mon Feb 18 15:09:16 CET 2013


On 18/02/13 12:11, Dave Angel wrote:
> On 02/18/2013 06:47 AM, John Reid wrote:
>> Hi,
>>
>> I was hoping namedtuples could be used as replacements for tuples in
>> all instances. There seem to be some differences between how tuples
>> and namedtuples are created. For example with a tuple I can do:
>>
>> a=tuple([1,2,3])
>>
>> with namedtuples I get a TypeError:
>>
>> from collections import namedtuple
>> B=namedtuple('B', 'x y z')
>> b=B([1,2,3])
> 
> You are passing a single list to the constructor, but you specified that
> the namedtuple was to have 3 items.  So you need two more.

I'm aware how to construct the namedtuple and the tuple. My point was
that they use different syntaxes for the same operation and this seems
to break ipython. I was wondering if this is a necessary design feature
or perhaps just an oversight on the part of the namedtuple author or
ipython developers.




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