creating list n many times

asked 2015-10-12 15:45:30 +0100

GA316
129 ●7 ●13 ●20

How to define n many empty lists where n is the number of vertices of the given arbitrary graph.

Thanks in advance.

answered 2015-10-12 15:52:37 +0100

B r u n o
1603 ●5 ●21 ●43

If n is your number of vertices, you can for instance create a list of n empty lists as follows:

sage: L = [[] for _ in range(n)]

And then you can access the (empty) list number i (for i from 0 to n-1) using:

sage: L[i]
[]
sage: L[i].append(0)
sage: L[i]
[0]

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thanks. is this like two dimensional list?

GA316 ( 2015-10-12 15:56:40 +0100 )edit

I don't know what you mean by "two dimensional list". As defined in my answer, L is a "list of list", so in some sense can be thought of as "two dimensional". To access the third element of the second list in L, you would for instance write L[1][2].

B r u n o ( 2015-10-12 18:33:44 +0100 )edit

Thanks a lot Bruno.

GA316 ( 2015-10-13 06:37:32 +0100 )edit

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