[Tutor] Challenge supporting custom deepcopy with inheritance

[Alan Gauld]

"Kent Johnson" <kent37 at tds.net> wrote

> > We can fake the Delphi style by using a default constructor and then 
> > just
> > calling the "constructors" after initialisation:
> > But its two lines not one... :-(
>
> Why not this?
>
> class C:
>   def __init__(self): pass
>
>  @staticmethod
>   def LoadFromFile(fname, count):
>     c = C()
>     # init c from the file
>     return c
>
> and similar for Create(). Client code is one line:
> c = C.LoadFromFile(fn, cnt)

Why not indeed?! I must remember that pattern for future reference.
Wish I'd thought of it a few months ago when I was wrestling with a
problem that could have used multiple constructors!

Alan G.