# creating list n many times

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

Thanks in advance.

creating list n many times

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

Thanks in advance.

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1

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]
```

Asked: **
2015-10-12 08:45:30 -0500
**

Seen: **80 times**

Last updated: **Oct 12 '15**

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