[Tutor] Help please

[Pinedo, Ruben A]

I was given this code and I need to modify it so that it will:

#1. Error handling for the files to ensure reading only .txt file
#2. Print a range of top words... ex: print top 10-20 words
#3. Print only the words with > 3 characters
#4. Modify the printing function to print top 1 or 2 or 3 ....
#5. How many unique words are there in the book of length 1, 2, 3 etc

I am fairly new to python and am completely lost, i looked in my book as to how to do number one but i cannot figure out what to modify and/or delete to add the print selection. This is the code:


import string

def process_file(filename):
    hist = dict()
    fp = open(filename)
    for line in fp:
        process_line(line, hist)
    return hist

def process_line(line, hist):
    line = line.replace('-', ' ')

    for word in line.split():
        word = word.strip(string.punctuation + string.whitespace)
        word = word.lower()

        hist[word] = hist.get(word, 0) + 1

def common_words(hist):
    t = []
    for key, value in hist.items():
        t.append((value, key))

    t.sort(reverse=True)
    return t

def most_common_words(hist, num=100):
    t = common_words(hist)
    print 'The most common words are:'
    for freq, word in t[:num]:
        print freq, '\t', word

hist = process_file('emma.txt')
print 'Total num of Words:', sum(hist.values())
print 'Total num of Unique Words:', len(hist)
most_common_words(hist, 50)

Any help would be greatly appreciated because i am struggling in this class. Thank you in advance

Respectfully,

Ruben Pinedo
Computer Information Systems
College of Business Administration
University of Texas at El Paso
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