sort array python by column

Sorting a NumPy array by a column orders its rows based 
on the ordering of the values in the column. 
For example, sorting the array [[8 2 -2] [-4 1 7] [6 3 9]] 
by its second column returns [[-4 1 7] [8 2 -2] [6 3 9]].
USE numpy.args

sorted_array = an_array[numpy.argsort(an_array[:, 1])]

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