使用python创建层次结构数据。基于一系列结果

使用python创建层次结构数据。基于一系列结果,python,python-3.x,dictionary,data-structures,hierarchical-data,Python,Python 3.x,Dictionary,Data Structures,Hierarchical Data,我需要在python中转换层次嵌套字典中的数据列表。结构(父-子) 这是我的数据 list_data = [ { "id": 2, "father_id": 0, "desc": "Oficial de Negocios Senior", "name": "PEDRO MARTIN SOTO ROSALES" }, { "id": 4,

我需要在python中转换层次嵌套字典中的数据列表。结构(父-子)

这是我的数据

list_data = [
       {
           "id": 2,
           "father_id": 0,
           "desc": "Oficial de Negocios Senior",
           "name": "PEDRO MARTIN SOTO ROSALES"
       },
       {
           "id": 4,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Adriana Paredez"
       },
       {
           "id": 5,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Hugo Miranda"
       },
       {
           "id": 3,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Mario Azcona"
       },
           {
                  "id": 6,
                  "father_id": 3,
                  "desc": "vendedor",
                  "name": "Diana Diaz"
              }
      ]
我已经尝试过这个递归函数,我得到了正确的结构,但是它聚合了前三个子函数的另外两个副本,我真的不需要它。根父元素是父元素id为0的元素

def build(loc_key):

    children = {row['id']: {'name': row['name'], 'desc': row['desc'],
                                'child':[]} for row in list_data if row['father_id'] == loc_key}

    data = {}

    for key, value in children.items():
        data[key] = value
        for item in list_data:
            if item['father_id'] == key:
                data[key]['child'].append(build(key))
    return data

print(build(0))
这基本上就是我需要得到的

data = {
       2: {'desc': 'Oficial de Negocios Senior',
          'name': 'PEDRO MARTIN SOTO ROSALES', 
          'child': 
              [
              {3: {'desc': 'Ejecutivo comercial', 
                  'name': 'Mario Azcona', 
                  'child': [
                            {6: {'desc': 'vendedor', 
                                'name': 'Diana Diaz', 
                                 'child': []}}]}, 
              4: {'desc': 'Ejecutivo comercial', 
                 'name': 'Adriana Paredez', 
                 'child': []}, 
              5: {'desc': 'Ejecutivo comercial', 
                 'name': 'Hugo Miranda', 
                 'child': []}

PD:我需要以动态的方式支持它,因为用户可以在数据库中添加子节点。

我认为问题在于,您的
构建
函数将节点列表作为输入,而不是成对地或以某种其他“较小列表”的方式对单个节点进行操作。因此,递归在这里没有真正的意义。OTOH,一旦您构建了树(顺便说一句,您正试图构建一棵树),那么递归将非常有助于解析结果结构。但是,它对构建树没有多大帮助

这里有一种方法可以构建树。它是
O(n)
computetime和memory,但在操作中确实存储了列表的多个副本,因此可能存在一些优化

import pprint

list_data = [
       {
           "id": 2,
           "father_id": 0,
           "desc": "Oficial de Negocios Senior",
           "name": "PEDRO MARTIN SOTO ROSALES"
       },
       {
           "id": 4,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Adriana Paredez"
       },
       {
           "id": 5,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Hugo Miranda"
       },
       {
           "id": 3,
           "father_id": 2,
           "desc": "Ejecutivo comercial",
           "name": "Mario Azcona"
       },
       {
           "id": 6,
           "father_id": 3,
           "desc": "vendedor",
           "name": "Diana Diaz"
       }
]

def tree_structure(list_data):
    #build the requisite data structure in a "flat" way... you can initialize this "as you go" in the loop below if more optimization is needed.
    data = {row["id"]: {"desc": row["desc"], "name": row["name"], "child": {}} for row in list_data}
    root_id = None
    for row in list_data:
        if row["father_id"] != 0:
            data[row["father_id"]]["child"][row["id"]] = data[row["id"]] #note that this stores only a reference to the child dictionary, so it is O(1) memory
        else:
            root_id = row["id"] #we need this later
    return {root_id: data[root_id]}

pprint.pprint(tree_structure(list_data))

请注意,
pprint
以与预期输出不同的顺序打印
desc
name
child
。这是因为字典没有内在的顺序,结果数据结构是相同的。我决定用另一种方法,但我认为这比我的方法好