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python program to generate random strings,numbers and export them to a file

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Mar 11 16:03:44 2018

@author: beast
"""
from random import *
file_limit=50000 #a file with (size) number of characters 

with open ("random.txt","w") as file :
    for i in range (file_limit):   
        start=choice([48,65,97]) #make choice among three group i.e whether new character should be a digit ,uppercase or lowercase character 
        end=0 #initialize end with 0
        if start==48:end=58 # deicde end point 
        elif start==65:end=91
        else:end=123
        
        breakrnd=randint(0,2)
        breakrnd2=randint(0,2)
        breakrnd3=randint(0,2)
        breakrnd4=randint(0,2)
        rand=randrange(start,end)#now select any character from given range  
        file.write("{0:c}".format(rand)) # writing character obtained from ascii code ...
        if breakrnd*breakrnd2*breakrnd3*breakrnd4==1 : # random places inserting breaks eg a new line or etc
            brk=choice(["\n","\t"," "])
            file.write(brk)
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