update from Atlas

attic/iterables/CACM/haha.py

@@ -0,0 +1,17 @@
+"""
+Erik Meijer. 2014. The curse of the excluded middle.
+Commun. ACM 57, 6 (June 2014), 50-55. DOI=10.1145/2605176
+http://doi.acm.org/10.1145/2605176
+"""
+
+def ha():
+    ha = 'Ha'
+    print(ha)
+    return ha
+
+# prints 'Ha' twice before showing result
+print('result ->', ha() + ha())
+
+# prints 'Ha' only once before showing reult
+ha_res = ha()  # common subexpression elimination
+print('result ->', ha_res + ha_res)