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sum of column in 2d array python

col_totals = [sum(x) for x in zip(*my_list)]
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sum 2d array in python

#create 2D array Matrix 4X4
Matrix = [[0 for i in range(4)] for j in range(4)]
#2D array python 
 x=[[11, 12,13],[14, 15,16],[17, 18,19]]                                                   
sum(sum(x,[]))
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