Added a tutorial note and example regarding the scope of loop variables

in a list comprehension.  Includes a justification and a comparision
to regular for-loops.

Closes SF bug 605047.

diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index 5c1e94b994a3d4770969b990909329f1499da976..444e7d97c614cd8764d4e54e94f67d52b8d52512 100644 (file)
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -1862,6 +1862,19 @@ SyntaxError: invalid syntax
 [8, 12, -54]
 \end{verbatim}
 
+To make list comprehensions match the behavior of \keyword{for}
+loops, assignments to the loop variable remain visible outside
+of the comprehension:
+
+\begin{verbatim}
+>>> x = 100                     # this gets overwritten
+>>> [x**3 for x in range(5)]
+[0, 1, 8, 27, 64]
+>>> x
+4                               # the final value for range(5)
+>>
+\end{verbatim}
+
 
 \section{The \keyword{del} statement \label{del}}