updated from Atlas

attic/control/guido/guido2.py

@@ -0,0 +1,31 @@
+"""
+Exemplo adaptado da mensagem do Guido van Rossum em:
+https://groups.google.com/forum/#!msg/python-tulip/bmphRrryuFk/aB45sEJUomYJ
+http://bit.ly/yieldfrom
+
+    >>> principal_susto(ger1())
+    OK
+    Bu!
+
+Visualização no PythonTutor: http://goo.gl/m6p2Bc
+
+"""
+
+def ger1():
+    try:
+        val = yield 'OK'
+    except RuntimeError as exc:
+        print(exc)
+    else:
+        print(val)
+    yield  # para evitar o StopIteration
+
+
+def principal_susto(g):
+    print(next(g))
+    g.throw(RuntimeError('Bu!'))
+
+
+# auto-teste
+import doctest
+doctest.testmod()