Update collections.rst (yasoob#181)

jpastuszuk · yasoob · commit b0b664392470 · 2018-11-30T11:08:45.000-05:00
Little change to how import is written to make it consistent with rest of examples
diff --git a/collections.rst b/collections.rst
@@ -68,8 +68,8 @@ share a solution using ``defaultdict``.
 
 .. code:: python
 
-    import collections
-    tree = lambda: collections.defaultdict(tree)
+    from collections import defaultdict
+    tree = lambda: defaultdict(tree)
     some_dict = tree()
     some_dict['colours']['favourite'] = "yellow"
     # Works fine
