Median v20

def swap(x,y):
    return y,x
def median_v20(a,b,c):
    if (a < b):
        a,b = swap(a,b)
    if (b < c):
        b,c = swap(b,c)
    if (a < b):
        a,b = swap(a,b)
    result = b
    return result