Skip, I think you have misunderstood the point I was making. It was
not whether the loop variable should leak out of a list comprehension.
Rather, it was whether a local variable should, so to speak, "leak into"
a list comprehension. And the answer is: it depends on whether the code
is executed normally, or via exec/eval. Example:
x = 1
print([x+i for i in range(1,3)]) # Prints [2,3]
exec('print([x+i for i in range(1,3)])') # Raises NameError (x)
I (at least at first) found the difference in behaviour surprising.
Change 'def' to 'class' and run it again. You'll be even more surprised.