填充一個字典的值，它本身就在一個串列中

我有個問題。我有一個list，而這又包含dicts. 問題是dicts罐子有不同的尺寸。某些元素中缺少某些元素dicts。dicts是否可以選擇用缺少的屬性填充？這只是填充的問題，keys并且可以簡單地用 填充值None。

下面的例子

[
{'_id': 'orders/213123',
 'contactEditor': {'name': 'Max Power',
                   'phone': '1234567'},
 'isCompleteDelivery': False,
},
{'_id': 'orders/2173823',
 'contactEditor': {'name': 'Michael'},
},
]

事實證明，第一個元素擁有最多keys，而第二個元素缺少以下keys phoneand isCompleteDelivery。

這是填寫的，看起來像這樣

[
{'_id': 'orders/213123',
 'contactEditor': {'name': 'Max Power',
                   'phone': '1234567'},
 'isCompleteDelivery': False,
},
{'_id': 'orders/2173823',
 'contactEditor': {'name': 'Michael',
                   'phone': None},
 'isCompleteDelivery': None,
},
]

這給了我dict最多的元素和數量。

%%time
highest_element = 0
elements = 0
for i, element in enumerate(myList):
    counted = count(myList[i])
    if(counted > elements):
        elements = counted
        highest_element = i
        
print(str(elements)   " "   str(highest_element))

myList = [
{'_id': 'orders/213123',
 'contactEditor': {'name': 'Max Power',
  'phone': '1234567',
  'email': '[email protected]'},
 'contactSoldToParty': {'name': 'Max Not',
  'phone': '123456789',
  'email': '[email protected]'},
 'isCompleteDelivery': False,
 'metaData': {'dataOriginSystem': 'Goods',
  'dataOriginWasCreatedTime': '10:12:12',},
 'orderDate': '2021-02-22',
 'orderDateBuyer': '2021-02-22',
},
{'_id': 'orders/12323',
 'contactEditor': {'name': 'Max Power2',
  'phone': '1234567',
  'email': '[email protected]'},
 'contactSoldToParty': {'name': 'Max Not',
  'phone': '123456789',
  'email': '[email protected]'},
 'isCompleteDelivery': False,
 'metaData': {'dataOriginSystem': 'Goods',
  'dataOriginWasCreatedTime': '10:12:12',},
 },
{'_id': 'orders/12323',
 'contactEditor': {'name': 'Max Power2',
  'phone': '1234567',
  'email': '[email protected]'},
 'contactSoldToParty': {'name': 'Max Not',
  'phone': '123456789',
  'email': '[email protected]'},
 'orderDate': '2021-02-22',
 'orderDateBuyer': '2021-02-22',
 },
{'_id': 'orders/12323',
 'contactEditor': {'name': 'Max Power2',
  'phone': '1234567',
  'email': '[email protected]'},
 'contactSoldToParty': {'name': 'Max Not',},
 'isCompleteDelivery': False,
 },
]

uj5u.com熱心網友回復：

如果我正確理解了這個問題，您似乎需要構建所有可能鍵的超集。一旦你有了它，你就可以遍歷串列并在每個字典中設定默認值。現在已經調整了“頂級”字典，您需要降低一個級別并對嵌套字典執行相同的操作。此代碼僅限于問題中所示的資料結構。

list_ = [
    {'_id': 'orders/213123',
     'contactEditor': {'name': 'Max Power',
                       'phone': '1234567'},
     'isCompleteDelivery': False,
     },
    {'_id': 'orders/2173823',
        'contactEditor': {'name': 'Michael'},
     }
]

def modkv(L, K):
    superset_ = set(key for dict_ in list_ for key in dict_[K])
    for dict_ in L:
        for key in superset_:
            dict_[K].setdefault(key, None)

superset = set(key for dict_ in list_ for key in dict_)

for dict_ in list_:
    for key in superset:
        dict_.setdefault(key, None)

for dict_ in list_:
    for k, v in dict_.items():
        if isinstance(v, dict):
            modkv(list_, k)

print(list_)

輸出：

[{'_id': 'orders/213123', 'contactEditor': {'name': 'Max Power', 'phone': '1234567'}, 'isCompleteDelivery': False}, {'_id': 'orders/2173823', 'contactEditor': {'name': 'Michael', 'phone': None}, 'isCompleteDelivery': None}]

uj5u.com熱心網友回復：

如果字典中不存在帶有 value 的代碼，則此代碼會生成一個鍵None。

lst = [
{'_id': 'orders/213123',
 'contactEditor': {'name': 'Max Power',
                   'phone': '1234567'},
 'isCompleteDelivery': False,
},
{'_id': 'orders/2173823',
 'contactEditor': {'name': 'Michael'},
},
]

complete_dict = {'_id': None,
 'contactEditor': {'name': None,
                   'phone': None},
 'isCompleteDelivery': None,
} 

# here complete dictionary means which is contain all possible keys.
all_keys = complete_dict.keys() 
for i,value in enumerate(lst):
    for a in all_keys:
        try:
            value[a]
        except KeyError:
            value[a]=None
        else:
            v = value[a]
            if isinstance(v,dict):
                for a2 in complete_dict[a].keys():
                    try:
                        v[a2]
                    except KeyError:
                        v[a2]=None
                value[a]=v

    del lst[i]
    lst.insert(i,value)
print(lst)

輸出

[{'_id': 'orders/213123',
 'contactEditor': {'name': 'Max Power', 'phone': '1234567'},
 'isCompleteDelivery': False},
 {'_id': 'orders/2173823',
 'contactEditor': {'name': 'Michael', 'phone': None}, 
 'isCompleteDelivery': None}]

標籤：Python 熊猫 列表 字典

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