Remove tabs from the documentation.
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
index f7e7243..2cc1e60 100644
--- a/Doc/tutorial/datastructures.rst
+++ b/Doc/tutorial/datastructures.rst
@@ -251,7 +251,7 @@
    []
    >>> [[x,x**2] for x in vec]
    [[2, 4], [4, 16], [6, 36]]
-   >>> [x, x**2 for x in vec]	# error - parens required for tuples
+   >>> [x, x**2 for x in vec]  # error - parens required for tuples
      File "<stdin>", line 1, in ?
        [x, x**2 for x in vec]
                   ^