如何在纸浆/蟒蛇中正确使用索引

Question

from pulp import *
import numpy as np
import pandas as pd

X = [1, 2]
Y = ['0-5', '5-10', '10-15']
A = [[1, 2, 3], 
 [4, 5, 6]]
test = makeDict((X, Y), A)

假设我有这个。我想找到x \ in X和y \ in Y的A（x，y + 1）-A（x，y）的值，并将其放入列表中。我怎样才能做到这一点？我可以打印A（x，y）。我这样做了，但是没有用。

B = []

for i in range(len(A)):
  for j in range(len(X)):
    x = A[i][j+1] - A[i][j]
    y = B.append(x)
    print(y)
test