joined ranges

[Skaperen]

given 4 ints which define 2 ranges, i can do

foo = [x for x in range(a,b)]+[x for x in range(c,d)]

but it would be nice if there was a more compact form like

foo = range(a,b,1,c,d,1) # warning: invalid code

anyone know of a compact way to join multiple ranges preferably in a range-like object? otherwise, i'm thinking of making a generator to do this.