"attn.steven.kuo at gmail.com" <attn.steven.kuo at gmail.com> writes: > mysets = [set(range(x[2],x[1])) for x in mylist] This is pretty horrible, each set can be arbitrarily large, i.e. if x[2] and x[1] are 0 and 1000000, you get a set with a million elements.