Question

我正在查询数据库，以便它返回如下内容：

[{"Name": "John", "hair_color": "Brown", "eye_color": "Blue"},
 {"Name": "Sally", "hair_color": "Red", "eye_color": "Green"},
 {"Name": "Bill", "hair_color": NULL, "eye_color": "Blue"}
]

我如何遍历该词典列表以输出如下内容：

[{"John": {"Attribute": "hair_color", "Value": "Brown"}},
 {"John": {"Attribute": "eye_color", "Value": "Blue"}},
 {"Sally": {"Attribute": "hair_color", "Value": "Red"}},
 {"Sally": {"Attribute": "eye_color", "Value": "Green"}},
 {"Bill": {"Attribute": "hair_color", "Value": NULL}},
 {"Bill": {"Attribute": "eye_color", "Value": "Blue"}},
]

Answer 1

这是更简洁，更快速的代码版本

input_list = [{"Name": "John", "hair_color": "Brown", "eye_color": "Blue"},
              {"Name": "Sally", "hair_color": "Red", "eye_color": "Green"},
              {"Name": "Bill", "hair_color": None, "eye_color": "Blue"}]


output_list = [{person['Name']: {'Attribute': attr_key, 'Value': person[attr_key]}}
               for person in input_list for attr_key in person if attr_key != 'Name']

print(output)

输出：

[{'John': {'Attribute': 'hair_color', 'Value': 'Brown'}},
 {'John': {'Attribute': 'eye_color', 'Value': 'Blue'}},
 {'Sally': {'Attribute': 'hair_color', 'Value': 'Red'}},
 {'Sally': {'Attribute': 'eye_color', 'Value': 'Green'}},
 {'Bill': {'Attribute': 'hair_color', 'Value': None}},
 {'Bill': {'Attribute': 'eye_color', 'Value': 'Blue'}}]

带循环的版本

# Empty output list
output_list2 = []

# Loop through persons dict
for person in input_list:

    # Save person name
    name = person['Name']

    # Loop through every attr the person
    for attr_key in person:

        # If arribute not Name add new dict to output list 
        if attr_key != 'Name':
            output_list2.append({name: {'Attribute': attr_key, 'Value': person[attr_key]}})   

print(output_list2)

输出版本2：

[{'John': {'Attribute': 'hair_color', 'Value': 'Brown'}},
 {'John': {'Attribute': 'eye_color', 'Value': 'Blue'}},
 {'Sally': {'Attribute': 'hair_color', 'Value': 'Red'}},
 {'Sally': {'Attribute': 'eye_color', 'Value': 'Green'}},
 {'Bill': {'Attribute': 'hair_color', 'Value': None}},
 {'Bill': {'Attribute': 'eye_color', 'Value': 'Blue'}}]

Answer 2

>>> lst = [{"Name": "John", "hair_color": "Brown", "eye_color": "Blue"},
...  {"Name": "Sally", "hair_color": "Red", "eye_color": "Green"},
...  {"Name": "Bill", "hair_color": "NULL", "eye_color": "Blue"}
... ]
>>> 
>>> res = [{d['Name']: {"Attribute": k, "Value": v}} for d in lst for k,v in d.items() if k!='Name']
>>>
>>> pprint(res)
[{'John': {'Attribute': 'hair_color', 'Value': 'Brown'}},
 {'John': {'Attribute': 'eye_color', 'Value': 'Blue'}},
 {'Sally': {'Attribute': 'hair_color', 'Value': 'Red'}},
 {'Sally': {'Attribute': 'eye_color', 'Value': 'Green'}},
 {'Bill': {'Attribute': 'hair_color', 'Value': 'NULL'}},
 {'Bill': {'Attribute': 'eye_color', 'Value': 'Blue'}}]

嵌套字典中的字典

2 个答案: