--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/deque	Thu Jan 30 10:17:40 2014 +0100
@@ -0,0 +1,19 @@
+**Wrong:**
+{{{#!python
+queue = [root]
+while queue:
+    item = queue.pop(0)
+    for child in item.children:
+        queue.append(child)
+}}}
+
+**Better:**
+{{{#!python
+import collections
+
+queue = collections.deque()
+while queue:
+    item = queue.popleft()
+    for child in item.children:
+        queue.append(child)
+}}}
\ No newline at end of file