73 lines
1.8 KiB
Python
Executable File
73 lines
1.8 KiB
Python
Executable File
#!/usr/bin/env python
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import sys, re, operator, string
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#
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# The functions
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#
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def read_file(path_to_file):
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"""
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Takes a path to a file and returns the entire
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contents of the file as a string
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"""
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with open(path_to_file) as f:
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data = f.read()
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return data
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def filter_chars_and_normalize(str_data):
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"""
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Takes a string and returns a copy with all nonalphanumeric
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chars replaced by white space
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"""
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pattern = re.compile('[\W_]+')
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return pattern.sub(' ', str_data).lower()
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def scan(str_data):
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"""
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Takes a string and scans for words, returning
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a list of words.
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"""
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return str_data.split()
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def remove_stop_words(word_list):
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"""
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Takes a list of words and returns a copy with all stop
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words removed
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"""
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with open('../stop_words.txt') as f:
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stop_words = f.read().split(',')
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# add single-letter words
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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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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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return sorted(word_freq.iteritems(), key=operator.itemgetter(1), reverse=True)
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def print_all(word_freqs):
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if(len(word_freqs) > 0):
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print word_freqs[0][0], ' - ', word_freqs[0][1]
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print_all(word_freqs[1:]);
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#
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# The main function
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#
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print_all(sort(frequencies(remove_stop_words(scan(filter_chars_and_normalize(read_file(sys.argv[1]))))))[0:25])
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