clarify discussion of iteration in the section on the "for" statement

(SF bug #829073)

diff --git a/Doc/ref/ref7.tex b/Doc/ref/ref7.tex
index 92ee6552b1558e91c2935e98093c891ee6a5d737..5e50a74e2a9289361b93335bb9560930cef51770 100644 (file)
--- a/Doc/ref/ref7.tex
+++ b/Doc/ref/ref7.tex
@@ -134,8 +134,10 @@ sequence (such as a string, tuple or list) or other iterable object:
   \productioncont{["else" ":" \token{suite}]}
 \end{productionlist}
 
-The expression list is evaluated once; it should yield a sequence.  The
-suite is then executed once for each item in the sequence, in the
+The expression list is evaluated once; it should yield an iterable
+object.  An iterator is created for the result of the
+{}\code{expression_list}.  The suite is then executed once for each
+item provided by the iterator, in the
 order of ascending indices.  Each item in turn is assigned to the
 target list using the standard rules for assignments, and then the
 suite is executed.  When the items are exhausted (which is immediately