code for chapter 5

05_hash_tables/python/01_price_of_groceries.py

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+book = dict()
+# an apple costs 67 cents
+book["apple"] = 0.67
+# milk costs $1.49
+book["milk"] = 1.49
+book["avocado"] = 1.49
+print book

05_hash_tables/python/02_check_voter.py

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+voted = {}
+def check_voter(name):
+  if voted.get(name):
+    print "kick them out!"
+  else:
+    voted[name] = True
+    print "let them vote!"
+
+check_voter("tom")
+check_voter("mike")
+check_voter("mike")