updated contents from Atlas repo

decorators/average_fixed_py2.py

@@ -0,0 +1,39 @@
+"""
+>>> avg = make_averager()
+>>> avg(10)
+10.0
+>>> avg(11)
+10.5
+>>> avg(12)
+11.0
+>>> avg.__code__.co_varnames
+('new_value',)
+>>> avg.__code__.co_freevars
+('ns',)
+>>> avg.__closure__  # doctest: +ELLIPSIS
+(<cell at 0x...: Namespace object at 0x...>,)
+>>> avg.__closure__[0].cell_contents.__dict__
+{'total': 33, 'num_items': 3}
+"""
+
+DEMO = """
+>>> avg.__closure__
+(<cell at 0x108df5980: Namespace object at 0x108e06790>,)
+"""
+
+
+class Namespace(object):
+    pass
+
+
+def make_averager():
+    ns = Namespace()
+    ns.num_items = 0
+    ns.total = 0
+
+    def averager(new_value):
+        ns.num_items += 1
+        ns.total += new_value
+        return float(ns.total) / ns.num_items
+
+    return averager