Maybe this is a very primative question, but I just get a bit confused about 'set' and 'Set' module in python. I understand 'set' is a build in type in python after 2.4(or 2.3) and Set a seperate module, anyhow, I gonna use build in 'set'. then the question is how can I declare a empty set variable as a 'var= []' do to a list variable?