如何从键中提取字典键？

Question

如何转换这种类型的字典：

       {"A":
       {"B":{"w":0.4},
       "C":{"w":0.6},
       "D":{"w":0.8}}, 
       "D":
       {"C":{"w":0.2},
       "A":{"w":0.8}}}

对于这种结构：

    {"A":{"B":0.4,"C":0.6,"D":0.8}, 
    "D":{"C":0.2,"A":0.8}}

谢谢

Answer 1

给定

x = {
  "A":{
    "B":{"w":0.4},
    "C":{"w":0.6},
    "D":{"w":0.8}},
  "D":{
    "C":{"w":0.2},
    "A":{"w":0.8}}}

你可以使用

w = {d:{i:x[d][i]['w'] for i in x[d]} for d in x}

或

g = lambda d: d['w'] if 'w' in d else {i:g(d[i]) for i in d}
w = g(x)

生成所需的结构。