python统计多个字典里某个键是特定值的键的个数

Question

fav_colors = {"John": {"a":"green","b":"green"}, "Bobby":{"a":"red","b":"yellow"}, "PapaSanta":{"a":"red","b":"green"}，“Jack”:{"a":"black","b":"yellow"}}

怎么统计fav_colors里套的字典里"b"的值是"green"的个数

Answer 1

fav_colors = {"John": {"a":"green","b":"green"}, "Bobby":{"a":"red","b":"yellow"}, "PapaSanta":{"a":"red","b":"green"},"Jack":{"a":"black","b":"yellow"}}
g=0
for a in fav_colors.keys():
  if (fav_colors[a]["b"] =="green") :
    g=g+1
print(g)