column and row in numpy array code example

Example 1: print column in 2d numpy array

import numpy as np
x=np.arange(25).reshape(5,5)
print(x)
#print(x[:,index_of_column_you_need])
print(x[:,3])

Example 2: data[:,:2]

X = dataset[:,0:3] is interpreted as "All rows for columns 0 through 3" and y = dataset[:,4] is interpreted as "all rows for column 4".