how to use key as index in nested dictionary?

Nagarjun
11 ●1 ●1 ●2

Iguananaut
1708 ●8 ●33 ●55

If I have A={1:{2:3,4:2},2:{}}, and I want to add elements to A[1]. How to add here?

2 Answers

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Emmanuel Charpentier
7774 ●6 ●51 ●154

Alternative solution:

sage: D={1:{2:3,4:2},2:{}}
sage: D[1].update({5:'smile'})
sage: D
{1: {2: 3, 4: 2, 5: 'smile'}, 2: {}}

Possibly more readable...

5261 ●3 ●44 ●117

Like that

sage: A={1:{2:3,4:2},2:{}}
sage: A[1][5]='smile'
sage: A
{1: {2: 3, 4: 2, 5: 'smile'}, 2: {}}

can i use this using for loop?

Nagarjun ( 2019-10-29 09:35:08 +0100 )edit

Sure you can use a loop; for instance:

sage: A={1:{2:3,4:2},2:{}}
sage: for key, value in A.items():
....:     value[5] = key^2
....:     
sage: A
{1: {2: 3, 4: 2, 5: 1}, 2: {5: 4}}

eric_g ( 2019-10-29 11:17:54 +0100 )edit

Thank You.

Nagarjun ( 2019-10-29 11:51:45 +0100 )edit

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