Only works in a GLOBAL scope, so the claims about "lexical" are wrong. Try adding to the wiki's code the function"
def f():
import math
with scope(math):
print sqrt(9)
and call it -- it will fail miserably. Reason: a real locals() [[one for a function, not for a module!]] does NOT let you create local names in the fly (be that with .update or otherwise), the _compiler_ must know which names are in fact local to the function. Sorry if this ticket is misfiled but I saw no other way to communicate a comment that's very important, as the wikipage/blogpost may be very misleading to readers without a firm grasp of Python internals...!!!
Alex
