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Python Program to Count the Occurrences of Each letter in a Given text file and write output to a file

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Mar 11 16:59:37 2018

@author: beast

"""
total=0
file_name="random.txt" #text filename of which letter frequency has to be obtained
alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" # a simple string containing letter which frequency has to be calculated 
freq_dict = { letter : 0 for letter in alphabet } # dict comprehesnion and initialization all key with 0
s=open(file_name,"r")
str=s.read() # get all the content 
for letter in str: # getting each character 
   if letter in alphabet: #if it belong to alphabet group then only count 
       freq_dict[letter] += 1
       total+=1 # increase the count 
s.close()       # close reading of input file 
output=open("Letter_frquency_outpput_generated.txt","w") #creeate a file to store the result
for letter in alphabet: 
    print("{} frequency ={:>5} \t percentage ={:.4f} %".format(letter,freq_dict[letter],(freq_dict[letter]/total)*100))
    output.write("{} frequency ={:>5} \t percentage ={:.4f} %".format(letter,freq_dict[letter],(freq_dict[letter]/total)*100))
    
    
output.close()    #done writing to the file ...bingo
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