python-numpyHow to get first column from Numpy array

import numpy as np
arr = np.array([[1, 2], [3, 4]])
row = arr[:,0]ctrl + cyoutubegithub

`import numpy as np` load Numpy module for Python	`[[1, 2], [3, 4]]` sample matrix data (2-dimensional array)
`np.array` declare Numpy array	`arr` variable contains array
`[:,0]` return first column ('0' index is for first column)

import numpy as np

arr = np.array([[1, 2], [3, 4]])
print(arr)

row = arr[:,0]
print(row)

[[1 2]
 [3 4]]
[1 3]