Question

Python Programming

Write a program that counts how often a word occurs in a text file.

Input: Ask the user for the name of an ASCII text file.

Output: Display the numbers of top frequently appeared words and their frequencies.

Pseudocode: 1) Read the file 2) Split the file into words 3) Count each word 4) Sort the words by frequencies, starting with the most frequent ones 5) Internally you should use some sort of data structure to keep track of all counted words and their respective frequencies. 6) Output the word and frequencies

Answer 1

#python program that prompts user to etner the text file name and then finds the frequency of the words in the text #file then sort the word count based on the value count using dictionary
#frequency.py
#import operator module
import operator
#prompt for text file name
filename=input('Enter the name of input file : ')
#creat a empty dictionary
dictionary = {}
#open file for reading all the text
alltext = open(filename, 'r')
#split the alltext into list of words
textlist = alltext.read().lower().split()
#insert the words in to dictionary
for word in textlist:
    count = dictionary.get(word, 0)
    dictionary[word] = count + 1
#print the heading
print ('%-20s%-10s'%('Word','Count'))
#sort the dictionary items by its values count
for key, value in sorted(dictionary.items(),key=operator.itemgetter(1),reverse=True):
    print ('%-20s%-10d'%(key, value))

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Sample Input file :

sample.txt

Old education him departure any began arranging one prevailed. Their end began whole might Old began her.

Sample Output:

Enter the name of input file : sample.txt
Word                Count   
began               3       
old                 2       
education           1       
him                 1       
departure           1       
any                 1       
arranging           1       
one                 1       
prevailed.          1       
their               1       
end                 1       
whole               1       
might               1       
her.                1