Create a dictionary from a nested list

Question

I am looking to convert the a list of 2-element lists to a dictionary. Note that I do not want to use group_by that has different outcomes than a simple conversion to dict. Is this possible? The two most obvious ways to try it out are not supported:

d = { x for x in [[1,2],[3,4]]}

Which gives us:

TypeError: unhashable type: 'list'

d = { *x for x in [[1,2],[3,4]]}

Which results in :

SyntaxError: iterable unpacking cannot be used in comprehension

@DanielMesejo: but that is a dict comprehension, not a set comprehension — RemcoGerlich, Sep 23 '19 at 12:54

Dani Mesejo · Accepted Answer · 2019-09-23T12:57:12.317

1

You should do:

d = { x: y for x, y in [[1,2],[3,4]]}

Output

{1: 2, 3: 4}

As suggested by @DeepSpace you could do:

dict([[1,2],[3,4]])

edited Sep 23 '19 at 12:57

answered Sep 23 '19 at 12:54

Dani Mesejo

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No need for the loop. Just do `dict([[1, 2], [3, 4]])` – DeepSpace Sep 23 '19 at 12:56

Create a dictionary from a nested list

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