使用生成器的方式，嵌套字典所有层级的key值路径

a = {
   "checksum": "b884cbfb1a6697fa9b9eea9cb2054183",
   "roots": {
      "bookmark_bar": {
         "children": [ {
            "date_added": "12989159740428363",
            "id": "4",
            "name": "test2",
            "type": "url",
            "url": "chrome://bookmarks/#1"
         } ],
         "date_added": "12989159700896551",
         "date_modified": "12989159740428363",
         "id": "1",
         "name": "bookmark_bar",
         "type": "folder"
      },
      "other": {
         "children": [ {
            "date_added": "12989159740428363",
            "id": "4",
            "name": "test",
            "type": "url",
            "url": "chrome://bookmarks/#1"
         } ],
         "date_added": "12989159700896557",
         "date_modified": "0",
         "id": "2",
         "name": "aaa",
         "type": "folder"
      },
      "synced": {
         "children": [  ],
         "date_added": "12989159700896558",
         "date_modified": "0",
         "id": "3",
         "name": "bbb",
         "type": "folder"
      }
   },
   "version": 1
}
def traverse(dic, path=None):
    if not path:
        path=[]
    if isinstance(dic,dict):
        for x in dic.keys():
            local_path = path[:]
            local_path.append(x)
            for b in traverse(dic[x], local_path):
                 yield b
    else:
        yield path,dic

for i ,v in traverse(a):
    print(i,v)
    if isinstance(v,list):
        if not v:
            continue
        for s,d in traverse(v[0],i):
            print("s,d:" + str(s),str(d))