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DS-1000 / 349 / How do i get the length of the row in a 2D array?

Problem

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Problem:
How do i get the length of the row in a 2D array?
example, i have a nD array called a. when i print a.shape, it returns (1,21). I want to do a for loop, in the range of the row size (21) of the array a. How do i get the value of row size as result?
A:
<code>
import numpy as np
a = np.random.rand(np.random.randint(5, 10), np.random.randint(6, 10))
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
349
task_id
e86466ba-d30c-566c-9ab7-647736d32417
task_key
default--test--349
task_revision_id
1
config / split
default / test

Official source

initial import