diff --git a/apriori.py b/apriori.py
index 8ae4682..dd48e99 100644
--- a/apriori.py
+++ b/apriori.py
@@ -100,7 +100,7 @@ def getSupport(item):
                            for item in value])
 
     toRetRules = []
-    for key, value in largeSet.items()[1:]:
+    for key, value in list(largeSet.items())[1:]:
         for item in value:
             _subsets = map(frozenset, [x for x in subsets(item)])
             for element in _subsets:
@@ -115,21 +115,21 @@ def getSupport(item):
 
 def printResults(items, rules):
     """prints the generated itemsets sorted by support and the confidence rules sorted by confidence"""
-    for item, support in sorted(items, key=lambda (item, support): support):
-        print "item: %s , %.3f" % (str(item), support)
-    print "\n------------------------ RULES:"
-    for rule, confidence in sorted(rules, key=lambda (rule, confidence): confidence):
+    for item, support in sorted(items, key=lambda x: x[1]):
+        print("item: %s , %.3f" % (str(item), support))
+    print("\n------------------------ RULES:")
+    for rule, confidence in sorted(rules, key=lambda x: x[1]):
         pre, post = rule
-        print "Rule: %s ==> %s , %.3f" % (str(pre), str(post), confidence)
+        print("Rule: %s ==> %s , %.3f" % (str(pre), str(post), confidence))
 
 
 def dataFromFile(fname):
         """Function which reads from the file and yields a generator"""
-        file_iter = open(fname, 'rU')
-        for line in file_iter:
-                line = line.strip().rstrip(',')                         # Remove trailing comma
-                record = frozenset(line.split(','))
-                yield record
+        with open(fname, 'rU') as file_iter:
+            for line in file_iter:
+                    line = line.strip().rstrip(',')                         # Remove trailing comma
+                    record = frozenset(line.split(','))
+                    yield record
 
 
 if __name__ == "__main__":
@@ -158,7 +158,7 @@ def dataFromFile(fname):
     elif options.input is not None:
             inFile = dataFromFile(options.input)
     else:
-            print 'No dataset filename specified, system with exit\n'
+            print('No dataset filename specified, system with exit\n')
             sys.exit('System will exit')
 
     minSupport = options.minS