In [34]:

    

import numpy as np


    

In [35]:

    

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


    

In [36]:

    

breakpoint = 127
t = set()
def AddElements(line):
    elements = line.split(" ")
    for element in elements:
        t.add(element.strip())


    

In [37]:

    

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


    

In [38]:

    

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


    

In [40]:

    

WriteToFile()


    

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