def adder(): s = 0 def a(x): s += x return sum return a pos, neg = adder(), adder() for i in range(10): print pos(i), neg(-2*i) This should work, right? Why does it not? Checkout slide no. 37 of a Tour of Go to know inspiration. Just wanted to see if python was the same as Go in this regard. Sorry, if I'm being rude, or anything.