reversing string def revstring( )if =""return " restrev revstring( [ :]first [ : now put the pieces together result restrev first return result def main()print(revstring("hello") if __name__ ="__main__"main(notice the similarity of these two functions the functions are nearly identical that' because the recursive definition of reverse did not change the only change is that we must use the string concatenation operator instead of the list concatenation operator and the empty string instead of the empty list another version of reverse def revlist (lst) def revlisthelper(index)if index =- return [ restrev revlisthelper(index- first [lst[index] now put the pieces together result first restrev return result this is the one line of code for the revlist function return revlisthelper(len(lst)- def main()print(revlist ([ , , , ]) if __name__ ="__main__"main(the examples in sects and used slicing to make the list or string smaller on each recursive call it is possible to make list or string smaller without actually making it physically smaller using an index to keep track of your position this copy belongs to 'acha