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python - 从输出字典中的重复值和交换值创建字典

问题描述

寻找最有效的方法来复制字典中的每个项目，但交换两个属性的属性值并附加到新字典。

（属性“juncA”和“juncB”必须在复制的项目上交换它们的值）。

非常简单：获取“当前”字典中的内容并生成“所需”输出。

当前的：

{
  "junctionMatrix": [
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47D",
        "juncB": "CR-03.0",
        "juncDistance": 8501.86072183
      }
    },
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47B_C",
        "juncB": "S47D_S",
        "juncDistance": 17535.28122721
      }
    }
   ]
 }

期望：

{
  "junctionMatrix": [
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47D",
        "juncB": "CR-03.0",
        "juncDistance": 8501.86072183
      }
    },
    {
      "attributes": {
      "WCU": "C1",
      "calcMethod": "AERIAL",
      "juncA": "CR-03.0",
      "juncB": "S47D",
      "juncDistance": 8501.86072183
    }
    },
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47B_C",
        "juncB": "S47D_S",
        "juncDistance": 17535.28122721
      }
    },
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47D_S",
        "juncB": "S47B_C",
        "juncDistance": 17535.28122721
      }
    }
   ]
 }

标签： pythondictionary

解决方案

一种方法是使用一个辅助函数来创建新元素并返回它，以便将它附加到列表中：

inDict= {
  "junctionMatrix": [
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47D",
        "juncB": "CR-03.0",
        "juncDistance": 8501.86072183
      }
    },
    {
      "attributes": {
        "WCU": "C1",
        "calcMethod": "AERIAL",
        "juncA": "S47B_C",
        "juncB": "S47D_S",
        "juncDistance": 17535.28122721
      }
    }
   ]
 }

# Auxiliary function.
def swap(elem):
    newElem = {'attributes': {'WCU':elem['attributes']['WCU'], 
    'calcMethod':elem['attributes']['calcMethod'],
    'juncA':elem['attributes']['juncB'], 
    'juncB':elem['attributes']['juncA'],
    'juncDistance':elem['attributes']['juncDistance']}}
    return newElem

# Creating the new dict.
newDict = {'junctionMatrix':[]}
for index, elem in enumerate(inDict['junctionMatrix']):
    newDict['junctionMatrix'].append(elem)
    newDict['junctionMatrix'].append(swap(elem))

#Printing it.
for i in newDict['junctionMatrix']:
    print(i)

结果：

{'attributes': {'WCU': 'C1', 'calcMethod': 'AERIAL', 'juncA': 'S47D', 'juncB': 'CR-03.0', 'juncDistance': 8501.86072183}}
{'attributes': {'WCU': 'C1', 'calcMethod': 'AERIAL', 'juncA': 'CR-03.0', 'juncB': 'S47D', 'juncDistance': 8501.86072183}}
{'attributes': {'WCU': 'C1', 'calcMethod': 'AERIAL', 'juncA': 'S47B_C', 'juncB': 'S47D_S', 'juncDistance': 17535.28122721}}
{'attributes': {'WCU': 'C1', 'calcMethod': 'AERIAL', 'juncA': 'S47D_S', 'juncB': 'S47B_C', 'juncDistance': 17535.28122721}}

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