[英]Mapping a Python dictionary to new attributes in an object
我想将字典的子集 map 转换为 class 但名称不同的属性。 例如:
D = { "City" : {
"Name": "Minneapolis",
"Weather Forecast": "Sunny with chance of rain",
"Temperature" : 55
}
"State": "MN",
"Area Code": 651,
"Country": "US"
}
我想将上述字典 map 转换为 Object 属性“名称”、“预测”和“区域代码”,其值分别为“明尼阿波利斯”、“有雨的晴天”和 651,同时忽略其他键。 如果字典中不存在相应的键,我还希望这些属性为 None 。 有没有一种简单的方法和直接的方法可以在不明确检查每个特定键的情况下做到这一点?
from dataclasses import dataclass
@dataclass
class City:
name: str
forecast: str
area_code: int
@classmethod
def from_dict(cls, data):
name = data.get('City').get('Name')
forecast = data.get('City').get('Weather Forecast')
area_code = data.get('Area Code')
return cls(name, forecast, area_code)
# regular use:
c1 = City('Greensboro', 'Sunny', 336)
print(c1)
City(name='Greensboro', forecast='Sunny', area_code=336)
D = { "City" : {
"Name": "Minneapolis",
"Weather Forecast": "Sunny with chance of rain",
"Temperature" : 55
},
"State": "MN",
"Area Code": 651,
"Country": "US"
}
# alternate constructor using a dictionary
c2 = City.from_dict(D)
print(c2)
City(name='Minneapolis', forecast='Sunny with chance of rain', area_code=651)
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