-- coding: UTF-8 --

mylist = [-1,0,1,2,3,4];

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a = [i*2 for i in mylist];
print(a) #[-2, 0, 2, 4, 6, 8]

a = [i*2 for i in mylist if i>0];
print(a); #[2, 4, 6, 8]

a = [i*2 for i in mylist if i not in [-1,0,1]];
print(a); #[4, 6, 8]