From 12b2fadbabcd962e819b2d1747f6b7eb9a193307 Mon Sep 17 00:00:00 2001
From: Crista Lopes <crista@tagide.com>
Date: Sat, 28 Dec 2013 15:58:40 -0800
Subject: [PATCH] Use introspection more meaningfully

---
 15-introspective/tf-15.py | 27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/15-introspective/tf-15.py b/15-introspective/tf-15.py
index 01f9553..ab4af9d 100755
--- a/15-introspective/tf-15.py
+++ b/15-introspective/tf-15.py
@@ -1,22 +1,20 @@
 #!/usr/bin/env python
 import sys, re, operator, string, inspect
 
-#
-# The functions
-#
 def read_stop_words():
-    # Meta-level data: inspect.stack() and locals()
-    print "My name is " + inspect.stack()[0][3] + ", my arguments are " + str(locals().keys())
-    print "   and I'm being called from ", inspect.stack()[1][3]
+    """ This function can only be called from a function 
+        named extract_words."""
+    # Meta-level data: inspect.stack()
+    if inspect.stack()[1][3] != 'extract_words':
+        return None
+
     with open('../stop_words.txt') as f:
         stop_words = f.read().split(',')
     stop_words.extend(list(string.ascii_lowercase))
     return stop_words
 
 def extract_words(path_to_file):
-    # Meta-level data: inspect.stack() and locals()
-    print "My name is " + inspect.stack()[0][3] + ", my arguments are " + str(locals().keys())
-    print "   and I'm being called from ", inspect.stack()[1][3]
+    # Meta-level data: locals()
     with open(locals()['path_to_file']) as f:
         str_data = f.read()
     pattern = re.compile('[\W_]+')
@@ -25,9 +23,7 @@ def extract_words(path_to_file):
     return [w for w in word_list if not w in stop_words]
 
 def frequencies(word_list):
-    # Meta-level data: inspect.stack() and locals()
-    print "My name is " + inspect.stack()[0][3] + ", my arguments are " + str(locals().keys())
-    print "   and I'm being called from ", inspect.stack()[1][3]
+    # Meta-level data: locals()
     word_freqs = {}
     for w in locals()['word_list']:
         if w in word_freqs:
@@ -37,14 +33,9 @@ def frequencies(word_list):
     return word_freqs
 
 def sort(word_freq):
-    # Meta-level data: inspect.stack() and locals()
-    print "My name is " + inspect.stack()[0][3] + " and my arguments are " + str(locals().keys())
-    print "   and I'm being called from ", inspect.stack()[1][3]
+    # Meta-level data: locals()
     return sorted(locals()['word_freq'].iteritems(), key=operator.itemgetter(1), reverse=True)
 
-#
-# The main function
-#
 def main():
     word_freqs = sort(frequencies(extract_words(sys.argv[1])))
     for (w, c) in word_freqs[0:25]: