Changed the name of this style too

05-pipeline/tf-05.py

@@ -0,0 +1,75 @@
+#!/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 = f.read()
+    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 = f.read().split(',')
+    # add single-letter words
+    stop_words.extend(list(string.ascii_lowercase))
+    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
+        else:
+            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]
+        print_all(word_freqs[1:]);
+
+#
+# The main function
+#
+print_all(sort(frequencies(remove_stop_words(scan(filter_chars_and_normalize(read_file(sys.argv[1]))))))[0:25])
+