FLT_EPSILON = 1.19209290e-07

def get_weights2a(dists):
    total = 0.0
    result = [0.0 for i in dists]
    for di in range(len(dists)):        
        dist = dists[di]
        total += 1.0 / dist
    for i in range(len(result)):
        dist = dists[i]
        result[i] = (1.0 / dist) / total
    return result

def get_weights2(dists):
    dmax = max(dists)
    if dmax <= FLT_EPSILON: # Float division error protection.
        return [1.0/len(dists) for i in dists]
    total = 0.0
    result = [0.0 for i in dists]
    for di in range(len(dists)):        
        dist = dists[di]
        total += 1.0 / dist
    if total <= FLT_EPSILON: # Float division error protection.
        return [1.0/len(dists) for i in dists]
    for i in range(len(result)):
        dist = dists[i]
        result[i] = (1.0 / dist) / total
    return result

def run():
    dists = [5.0,2.1,3.6,8.7,0.3]
    dists.sort()
    weights = get_weights2(dists)
    both = zip(dists,weights)
    for i in both:
        print i
    total = 0.0
    for i in weights:
        total += i
    print total

run()