dict.items() is a list - linear access time whereas with 'for key in dict:'
access time is constant:
http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html#use-in-where-possible-1
10.08.2012, в 0:35, Tim Chase написал(а):
> On 08/09/12 15:22, Roman Vashkevich wrote:
>>> {(4, 5): 1, (5, 4): 1, (4, 4): 2, (2, 3): 1, (4, 3): 2}
>>> and i want to print to a file without the brackets comas and semicolon in
>>> order to obtain something like this?
>>> 4 5 1
>>> 5 4 1
>>> 4 4 2
>>> 2 3 1
>>> 4 3 2
>>
>> for key in dict:
>> print key[0], key[1], dict[key]
>
> This might read more cleanly with tuple unpacking:
>
> for (edge1, edge2), cost in d.iteritems(): # or .items()
> print edge1, edge2, cost
>
> (I'm making the assumption that this is a edge/cost graph...use
> appropriate names according to what they actually mean)
>
> -tkc
>
>
>
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