问如何计算字典中值的比率？

EN

d = {1.0: 11, 2.0: 3, 3.0: 7}

ratio_values = list(d.values())

count = len(ratio_values) - 1
ratio_sum = 0

for i in range(len(ratio_values) - 1):
    #adds the ratio between two consecutive values to the total sum
    ratio_sum += ratio_values[i]/ratio_values[i+1]

print(ratio_sum/count)

import numpy as np

arr = np.array(list(d.values()))
arr

ans = 0
ratios = []
for i in range(1, len(arr)):
    ratios.append(arr[i-1]/arr[i])
ans = sum(ratios)/len(ratios)

d = {1.0: 11, 2.0: 3, 3.0: 7}
d = list(d.values())

ratios = []
solution = 0.0

per = d[0]
for v in d[1:]:
    ratios.append(per/v)
    per = v

solution = sum(ratios)/len(ratios)