Advantages of Default Factory in Dataclasses

[David Lowry-Duda]

On Tue, Nov 16, 2021 at 06:24:43PM -0500, Alan Bawden wrote:
>    ```python
>    def add_to(elem, inlist=[]):
>        inlist.append(elem)
>        return inlist
> 
>    list1 = add_to(1)
>    list2 = add_to(2)
>    print(list1)  # prints [1]
>    print(list2)  # prints [1, 2], potentially confusing
>    ```
> 
> Not only does it not print what "most people" expect.  It also doesn't
> print what _you_ expect!  (But you made your point.)

Haha, you're right. I would guess that I reordered the statements when I 
quickly checked this in the interpreter. But indeed, both list1 and 
list2 point to inlist, and thus are the same. Whoops!

- DLD