def exchange_elements(lst):
    from itertools import zip_longest, chain, tee
    
    lst1, lst2 = tee(iter(lst), 2)
    return list(chain.from_iterable(zip_longest(lst[1::2], lst[::2])))
def exchange_elements(VAR_0):
    from itertools import zip_longest, chain, tee
   
    lst1, lst2 = tee(iter(VAR_0), 2)
    return list(chain.from_iterable(zip_longest(VAR_0[1::2], VAR_0[::2])))