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#!/usr/bin/env python
import sys, re, operator, string
# The functions
def read_file(path_to_file):
Takes a path to a file and returns the entire
contents of the file as a string
with open(path_to_file) as f:
data =
return data
def filter_chars_and_normalize(str_data):
Takes a string and returns a copy with all nonalphanumeric
chars replaced by white space
pattern = re.compile('[\W_]+')
return pattern.sub(' ', str_data).lower()
def scan(str_data):
Takes a string and scans for words, returning
a list of words.
return str_data.split()
def remove_stop_words(word_list):
Takes a list of words and returns a copy with all stop
words removed
with open('../stop_words.txt') as f:
stop_words =',')
# add single-letter words
return [w for w in word_list if not w in stop_words]
def frequencies(word_list):
Takes a list of words and returns a dictionary associating
words with frequencies of occurrence
word_freqs = {}
for w in word_list:
if w in word_freqs:
word_freqs[w] += 1
word_freqs[w] = 1
return word_freqs
def sort(word_freq):
Takes a dictionary of words and their frequencies
and returns a list of pairs where the entries are
sorted by frequency
return sorted(word_freq.iteritems(), key=operator.itemgetter(1), reverse=True)
def print_all(word_freqs):
Takes a list of pairs where the entries are sorted by frequency and print them recursively.
if(len(word_freqs) > 0):
print word_freqs[0][0], ' - ', word_freqs[0][1]
# The main function