add test-driven example

Author: rahulbot

.gitignore

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+*.pyc

election_results_test_file.csv

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+State Postal,County Name,FIPS,Obama vote,%,Romney vote,%
+AK,Alaska,0,91696,41.6,121234,55
+AL,Alabama,0,793620,38.4,1252453,60.7

electiondata.py

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+class ElectionResults:
+  
+  def __init__(self, filename):
+    self.filename = filename
+
+  def load(self):
+    self.file = open(self.filename, 'r')
+    self.all_lines = self.file.readlines()
+
+  def states(self):
+    all_names = []
+    for line in self.all_lines:
+      columns = line.split(',')
+      all_names.append(columns[1])
+    return all_names
+
+  def state_count(self):
+    return len(self.all_lines)

object-oriented.py

@@ -1 +1 @@
-# Print out all the state names from the csv# Coded in the "object-oriented" styleclass ElectionResults:    def __init__(self, filename):    self.filename = filename  def load(self):    self.file = open(filename, 'r')    self.all_lines = self.file.readlines()  def states(self):    all_names = []    for line in self.all_lines:      columns = line.split(',')      all_names.append(columns[1])    return all_names  def state_count(self):    return len(self.all_lines)filename = '2012_US_election_state.csv'results = ElectionResults(filename)results.load()print "Opened file:"state_names = results.states()for state in state_names:  print "  "+stateprint "done ("+str(results.state_count())+" lines)"
+# Print out all the state names from the csv# Coded in the "object-oriented" stylefrom electiondata import ElectionResultsfilename = '2012_US_election_state.csv'results = ElectionResults(filename)results.load()print "Opened file:"state_names = results.states()for state in state_names:  print "  "+stateprint "done ("+str(results.state_count())+" lines)"