Make Py3.x style "import builtins"
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index f409536..b6ab342 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -95,8 +95,8 @@
Example of simulating Python's internal lookup chain::
- import __builtin__
- pylookup = ChainMap(locals(), globals(), vars(__builtin__))
+ import builtins
+ pylookup = ChainMap(locals(), globals(), vars(builtins))
Example of letting user specified values take precedence over environment
variables which in turn take precedence over default values::