Remove trailing whitespace.
diff --git a/Doc/tutorial/interpreter.rst b/Doc/tutorial/interpreter.rst
index 0ac7ee1..1511584 100644
--- a/Doc/tutorial/interpreter.rst
+++ b/Doc/tutorial/interpreter.rst
@@ -112,7 +112,7 @@
    >>> the_world_is_flat = 1
    >>> if the_world_is_flat:
    ...     print "Be careful not to fall off!"
-   ... 
+   ...
    Be careful not to fall off!
 
 
@@ -180,7 +180,7 @@
 best way to do it is to put one more special comment line right after the ``#!``
 line to define the source file encoding::
 
-   # -*- coding: encoding -*- 
+   # -*- coding: encoding -*-
 
 
 With that declaration, all characters in the source file will be treated as