update from Atlas repo

iterables/yield_delegate_fix.py

@@ -0,0 +1,24 @@
+""" Example adapted from ``yield_delegate_fail.py``
+
+The following program performs a simple abstraction over the process of
+yielding.
+
+"""
+
+# BEGIN YIELD_DELEGATE_FIX
+def f():
+    def do_yield(n):
+        yield n
+    x = 0
+    while True:
+        x += 1
+        yield from do_yield(x)
+# END YIELD_DELEGATE_FIX
+
+if __name__ == '__main__':
+    print('Invoking f() now produces a generator')
+    g = f()
+    print(next(g))
+    print(next(g))
+    print(next(g))
+