Hi dkrumm,
On 3 Sep., 09:33, dkrumm <[email protected]> wrote:
> Is there a data structure in Python that would allow me to do the
> following:
>
> I have a list of positive integer pairs, say [[1,2], [1,3], [2,5]].
> For each pair [i,j] in my list I need to store in memory a number
> c[i,j]
Indeed, it is just a Python question. I suggest you read something
about Python dictionaries.
You could not index a Python dictionary by *lists*, because lists are
mutable, and hell breaks if the keys of a dictionary are modified
after creation. But they can be indexed by tuples.
Hence, you can do:
sage: L = [(1,2),(3,4),(5,6)]
sage: D = dict(zip(L,range(3)))
sage: D
{(1, 2): 0, (5, 6): 2, (3, 4): 1}
sage: D[3,4]
1
Best regards,
Simon
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