updated from Atlas

attic/functions/accgen.py

@@ -0,0 +1,36 @@
+"""
+Accumulator generator examples
+
+http://www.paulgraham.com/accgen.html
+
+    >>> f3 = foo(3)
+    >>> f3(2)
+    5
+    >>> f3(2)
+    7
+    >>> f3(2)
+    9
+
+
+"""
+
+class foo0:
+    def __init__(self, n):
+        self.n = n
+    def __call__(self, i):
+        self.n += i
+        return self.n
+
+def foo0(n):
+    def bar(i):
+        bar.s += i
+        return bar.s
+    bar.s = n
+    return bar
+
+def foo(n):
+    def bar(i):
+        nonlocal n
+        n += i
+        return n
+    return bar