On Sun, 2021-11-21 at 21:51 +0400, Abdur-Rahmaan Janhangeer wrote: > > On Tue, Nov 16, 2021 at 7:17 PM Paul Bryan <pbr...@anode.ca> wrote: > > On Tue, 2021-11-16 at 17:04 +0400, Abdur-Rahmaan Janhangeer wrote: > > > > > A simple question: why do we need field(default_factory ) in > > > dataclasses? > > > > > > To initialize a default value when a new instance of the dataclass > > is created. For example, if you want a field to default to a dict. > > A new dict is created for each instance of the dataclass created. > > > > > Why not have an attribute which returns a deep copy of a dict?
You can certainly write a default factory to return a deep copy. I'm not understanding your question about the attribute though. Attribute in what object? What might the code look like using an attribute? > Like the only advantage of default factory is copying whatever we > specify? The advantage of the default factory is that it can generate a value at the time a data class is initialized. -- https://mail.python.org/mailman/listinfo/python-list
