import numpy as np

arr1 = np.array([1, 2, 3, 4])
arr2 = np.array([5, 6, 7, 8])

# Vertical (column-wise) stacking #1
arr_stacked = np.stack([arr1, arr2], axis=1)
print('Numpy vertical stacking method #1')
print('---------------------------------')
print(arr_stacked)