#在我看来，一定有更好的方法来查找数据类对象，而不是遍历所有对象来找到特定的对象.
#My way, that I hope to improve:
def changeValueOf(primaryKey):
for item in self.addlist:
if item.id == primaryKey:
# Do stuff...
#Basics:
listOfKeys = "AA BB CC".split()
@dataclass
class Feld:
id: str
value1: str
value2: str
value3: str
self.addlist: List = []
for element in Daten:
data = Feld(element[0], element[1], element[2], int(element[3]))
self.addlist.append(data)
跟踪类的所有实例的一种常见而有效的方法是按特定键将每个实例存储在dict的类变量中，并使用类方法按键检索实例.在您的示例中，使用id属性作为键:
from typing import ClassVar
from dataclasses import dataclass
@dataclass
class Feld:
_id_to_instance: ClassVar[dict] = {}
id: str
value: str
def __post_init__(self):
self._id_to_instance[self.id] = self
@classmethod
def get_instance_by_id(cls, id):
return cls._id_to_instance[id]
因此:
for id, value in ('id1', 'value1'), ('id2', 'value2'):
Feld(id, value)
print(Feld.get_instance_by_id('id2'))
输出:
Feld(id='id2', value='value2')