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DS-1000 / 317 / I have a 2D list something like

Problem

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Problem:
I have a 2D list something like
a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] 
and I want to convert it to a 2d numpy array. Can we do it without allocating memory like
numpy.zeros((3,3))
and then storing values to it?
A:
<code>
import numpy as np
a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] 
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
317
task_id
82c0e1c9-10b0-5393-a78e-aad84db4cc88
task_key
default--test--317
task_revision_id
1
config / split
default / test

Official source

initial import