In [16]:

    

import numpy as np


    

In [17]:

    

f = open ('supermarket.txt')
lines = f.readlines()


    

In [18]:

    

breakpoint = 20
t = set()
def AddElements(line):
    elements = line.split(" ")
    for element in elements:
        t.add(element.strip())
def AllElementsinSet(line):
    elements = line.split(" ")
    for element in elements:
        if not element.strip() in t:
            return False
    return True


    

In [19]:

    

np.random.shuffle(lines)
outputfile=[]
def WriteToFile():
    output = open('supermarket.dat','w')
    for l in outputfile:
        output.write(l)


    

In [20]:

    

for line in lines:
    #outputfile.append(line)
    AddElements(line)
    if len(t)>breakpoint:
        break


    

In [22]:

    

for line in lines:
    if AllElementsinSet(line):
        outputfile.append(line)


    

In [40]:

    

WriteToFile()


    

In [24]:

    

len(outputfile)


    

    
Out[24]:





48