82 lines
2.4 KiB
Python
Executable File
82 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python
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import sys, re, operator, string, inspect
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#
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# The functions
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#
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def extract_words(path_to_file):
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"""
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Takes a path to a file and returns the non-stop
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words, after properly removing nonalphanumeric chars
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and normalizing for lower case
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"""
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assert(type(path_to_file) is str), "I need a string! I quit!"
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assert(path_to_file), "I need a non-empty string! I quit!"
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try:
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with open(path_to_file) as f:
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str_data = f.read()
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except IOError as e:
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print "I/O error({0}) when opening {1}: {2}! I quit!".format(e.errno, path_to_file, e.strerror)
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raise e
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pattern = re.compile('[\W_]+')
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word_list = pattern.sub(' ', str_data).lower().split()
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try:
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with open('../stop_words.txt') as f:
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stop_words = f.read().split(',')
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except IOError as e:
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print "I/O error({0}) when opening ../stops_words.txt: {1}! I quit!".format(e.errno, e.strerror)
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raise e
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stop_words.extend(list(string.ascii_lowercase))
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return [w for w in word_list if not w in stop_words]
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def frequencies(word_list):
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"""
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Takes a list of words and returns a dictionary associating
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words with frequencies of occurrence
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"""
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assert(type(word_list) is list), "I need a list! I quit!"
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assert(word_list <> []), "I need a non-empty list! I quit!"
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word_freqs = {}
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for w in word_list:
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if w in word_freqs:
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word_freqs[w] += 1
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else:
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word_freqs[w] = 1
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return word_freqs
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def sort(word_freq):
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"""
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Takes a dictionary of words and their frequencies
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and returns a list of pairs where the entries are
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sorted by frequency
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"""
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assert(type(word_freq) is dict), "I need a dictionary! I quit!"
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assert(word_freq <> {}), "I need a non-empty dictionary! I quit!"
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try:
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return sorted(word_freq.iteritems(), key=operator.itemgetter(1), reverse=True)
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except Exception as e:
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print "Sorted threw {0}: {1}".format(e)
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raise e
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#
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# The main function
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#
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try:
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assert(len(sys.argv) > 1), "You idiot! I need an input file! I quit!"
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word_freqs = sort(frequencies(extract_words(sys.argv[1])))
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assert(type(word_freqs) is list), "OMG! This is not a list! I quit!"
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assert(len(word_freqs) > 25), "SRSLY? Less than 25 words! I QUIT!"
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for tf in word_freqs[0:25]:
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print tf[0], ' - ', tf[1]
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except Exception as e:
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print "Something wrong: {0}".format(e)
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