python如何给字典的键对应的值为字典项的字典赋值


						问题 1：需要得到一个类似{“demo”:{“key”:”value”}}这样格式的字典dic。





dic = dict()

dic_temp = dict()

dic_temp = {"key":"value"}

dic["demo"] = dic_temp



问题 2：创建一个多值映射字典.。





d = {}

for key, value in pairs:

  if key not in d:

    d[key] = []

  d[key].append(value)



问题 3：需要得到一个类似[ { “id”:1,“text” : “Root node”, “children” : [ {“id”:2,”text”:”Child node 1”,”children”:true}，”Child node 2”] } ]这样格式的json文本。





import json

import codecs

import sys

reload(sys)

sys.setdefaultencoding('utf8')



def Format_data():

  HY_Info = Search_HYInfo()

  ChildNodes = Search_ChildNodes()

  print '开始格式化数据'



  HY_Nodes = []

  for HY_id in ChildNodes.keys():

    HY_Node = {}

    HY_Node['id'] = HY_id

    if HY_id in HY_Info.keys():

      HY_Node['text'] = HY_Info[HY_id].decode('gbk')+'('+str(HY_id)+')'

    else:

      HY_Node['text'] = '--'

    print HY_Node['text'] 

    HY_Node['children'] =[]

    for child_id in ChildNodes[HY_id]:

      child_Node = {}

      child_Node['id'] = child_id

      if child_id in HY_Info.keys():

        child_Node['text'] = HY_Info[child_id].decode('gbk') + '('+str(child_id) + ')'

      else:

        child_Node['text'] = '--'

      if child_id in ChildNodes.keys():

        child_Node['children'] = True

      else:

        child_Node['children'] = False

      HY_Node['children'].append(child_Node)



    HY_Nodes.append(HY_Node)



  json_data = json.dumps(HY_Nodes,ensure_ascii=False,encoding="gb2312")

  with codecs.open('./data/Parents_leves.json', "wb", "utf-8") as f:

    f.write(json_data)







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