+= as declaration wish

[Suchandra S Thapa]

	I agree with you.  I think having  x += y create a new
x would create more problems than it solves.  Currently typos in the 
variable name would raise an error that is easily caught and fixed, having
a new variable silently created just seems like a bad idea. I personally would
love it if python went the other way and allowed an optional mode that 
required variables to be declared before they were used.