In [1]:

    

import numpy as np


    

In [2]:

    

h1 = lambda x: 3 * x % 10
h2 = lambda x: (x + 7) % 10


    

In [3]:

    

S = [3, 4, 7, 9]
B = np.zeros(10)


    

In [4]:

    

for element in S:
    B[h1(element)] = 1
    B[h2(element)] = 1


    

In [5]:

    

B


    

    
Out[5]:





array([ 1.,  1.,  1.,  0.,  1.,  0.,  1.,  1.,  0.,  1.])

In [6]:

    

def test_new_element(element):
    if B[h1(element)] and B[h2(element)]:
        print('pass')
    else:
        print('discard')


    

In [7]:

    

test_new_element(2)


    

    




pass

In [8]:

    

test_new_element(5)


    

    




discard

In [13]:

    

(np.arange(100) % 4 + 1) * 5


    

    
Out[13]:





array([ 5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5,
       10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10,
       15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15,
       20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,
        5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5,
       10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20,  5, 10, 15, 20])