diff --git a/factory_method.py b/factory_method.py
index c21e3960..1f5d393f 100644
--- a/factory_method.py
+++ b/factory_method.py
@@ -13,10 +13,7 @@ def __init__(self):
 
     def get(self, msgid):
         """We'll punt if we don't have a translation"""
-        try:
-            return self.trans[msgid]
-        except KeyError:
-            return str(msgid)
+        return self.trans.get(msgid, msgid)
 
 
 class EnglishGetter:
diff --git a/iterator.py b/iterator.py
index 74d67138..ba7180d1 100644
--- a/iterator.py
+++ b/iterator.py
@@ -12,7 +12,7 @@ def count_to(count):
     """Counts by word numbers, up to a maximum of five"""
     numbers = ["one", "two", "three", "four", "five"]
     # enumerate() returns a tuple containing a count (from start which
-    # defaults to 0) and the values obtained from iterating over sequence
+    # defaults to 0) and the values obtained from iterating over sequences
     for pos, number in zip(range(count), numbers):
         yield number
 
diff --git a/mediator.py b/mediator.py
index 82a2886f..986c7490 100644
--- a/mediator.py
+++ b/mediator.py
@@ -30,6 +30,7 @@ def tearDown(self):
             print("Tearing down")
             time.sleep(0.1)
             self._tm.publishReport()
+            print("\n")
         else:
             print("Test not executed. No tear down required.")
 
@@ -108,17 +109,21 @@ def setTC(self, tc):
     reporter = Reporter()
     db = DB()
     tm = TestManager()
+
     tm.setReporter(reporter)
     tm.setDB(db)
+
     reporter.setTM(tm)
     db.setTM(tm)
     # For simplification we are looping on the same test.
     # Practically, it could be about various unique test classes and their
     # objects
-    for i in range(3):
+    for _ in range(3):
         tc = TC()
         tc.setTM(tm)
+
         tm.setTC(tc)
+
         tc.setup()
         tc.execute()
         tc.tearDown()
diff --git a/observer.py b/observer.py
index 4ce1aed6..d0bd573d 100644
--- a/observer.py
+++ b/observer.py
@@ -67,7 +67,6 @@ def main():
     data1.attach(view2)
     data2.attach(view2)
     data2.attach(view1)
-
     print("Setting Data 1 = 10")
     data1.data = 10
     print("Setting Data 2 = 15")
diff --git a/singleton.py b/singleton.py
new file mode 100644
index 00000000..753bc427
--- /dev/null
+++ b/singleton.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+ 
+class Hello(object):
+    singleton = None
+ 
+    def __new__(clz):
+        if not clz.singleton:
+            clz.singleton = super(Hello, clz).__new__(clz)
+        return clz.singleton
+ 
+    def __init__(self):
+        self.world = "world"
+        return None
+ 
+h = Hello()
+h.hello = "hello"
+ 
+print h.hello
+print h
+print h.world
+ 
+x = Hello()
+ 
+print x.hello
+print x
+print x.world
\ No newline at end of file