def median(lst):
    """
    Return the median of lst.
    """
    
    # make a copy of lst, so we don't change (sort) the original.
    # The problem didn't say you had to do this.
    mylst = lst[:]
    mylst.sort()
    n = len(mylst)
    
    if n%2 == 1:
        # odd length
        return mylst[(n-1)/2]
    else:
        # even length
        return (mylst[n/2 - 1] + mylst[n/2]) / 2.0

print median( [32,10,54,23,21] )
print median( [42,13,80,85,22,43] )