Fix typo.
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
index 4f3d498..defb47c 100644
--- a/Doc/tutorial/datastructures.rst
+++ b/Doc/tutorial/datastructures.rst
@@ -379,7 +379,7 @@
>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
>>> print(basket) # show that duplicates have been removed
- {'orange', 'bananna', 'pear', 'apple'}
+ {'orange', 'banana', 'pear', 'apple'}
>>> 'orange' in basket # fast membership testing
True
>>> 'crabgrass' in basket