Python: elif or new if?

Question

What is better to use:

if var in X:
    #do_whatever
elif (var in Y):
    #do_whatever2

or:

if var in X:
    #do_whatever
i         


        

Answer 1

If var can't be in both X and Y, then you should use elif. This way, if var in X is true, you don't need to pointlessly eval var in Y.