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In Python, how to sum columns of a NumPy array?

To sum the columns of a NumPy array, the best option is to use the numpy.sum() method by specifying the axis option:

>>> import numpy as np
>>> a = np.array([[1, 2], [3, 4], [5, 6]])
>>> a.sum(axis=0)
array([ 9, 12])


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