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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python如何给字典的键对应的值为字典项的字典赋值

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