In [1]:

    

import numpy as np
x = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19])
len (x)


    

    
Out[1]:





20

In [2]:

    

x[0:9]


    

    
Out[2]:





array([0, 1, 2, 3, 4, 5, 6, 7, 8])

In [3]:

    

x[1:9]


    

    
Out[3]:





array([1, 2, 3, 4, 5, 6, 7, 8])

In [4]:

    

x[0:10]


    

    
Out[4]:





array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

In [5]:

    

from random import randint
n =(randint(0, len(x)//4))
x[n:(n+(len(x)*3//4))]


    

    
Out[5]:





array([ 3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17])

In [ ]: