How do I do this? (eval() on the left hand side)

[Peter Hansen]

Nick Coghlan wrote:
> Generally, altering the contents of the dicts returned by locals() and 
> globals() is unreliable at best.

Nick, could you please comment on why you say this about globals()?
I've never heard of any possibility of "unreliability" in updating
globals() and, as far as I know, a large body of code exists which
does in fact rely on this -- much of mine included. ;-)

-Peter