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持久性物体和
原标题:Persistent objects and __repr__

处理<代码>_repr__()功能的最好办法是什么? 例如,在数据库中代表一行(有关或物体)。

根据 Python,_repr__()。 应将该物体重新编号为eval(),这样(大约)eval(repr(obj)= obj,或打字表示无效。 通常,这意味着将物体可能重新生成的所有数据倾倒在扼杀中。 然而,对于重新计算物体的持久性物体,从数据库中检索数据可能简单。

因此,就这些物体而言,所有物体数据或仅仅是__repr__()中的主要关键内容?

最佳回答

repr should return a string that would re-create the object with eval

这对简单的类型,如t或str或浮,是合法的做法,但不能用15+栏的多col银物体使用。

例如,如果我有一个代表价格的班子,则有理由订立<条码>_repr__。 说明其主要特征:数额和货币

def __repr__(self):
   return  %s %s %(self.amount,self.currency)
问题回答

如何从数据库中获取信息通常不感兴趣。 将物体重新编号为<代码>SomeModel(field1, Field2, ......)。





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