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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])
```