Michael Hudson <mwh@python.net>:
In particular what happens if the iteration variable is a local in the frame anyway? I presume that would inhibit the renaming
Why?
but then code like
def f(x): r = [x+1 for x in range(x)] return r, x
becomes even more incomprehensible (and changes in behaviour).
Anyone who writes code like that *deserves* to have the behaviour changed on them! If this is really a worry, an alternative would be to simply forbid using a name for the loop variable that's used for anything else outside the loop. That could break existing code too, but at least it would break it in a very obvious way by making it fail to compile. Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg@cosc.canterbury.ac.nz +--------------------------------------+