On Thu, 19 Oct 2023 at 19:34, Karsten Hilbert wrote:
>
> > > As per my recent foray into abusing existence-checking for Singleton
> > > assurance
> > > along such lines as
> > >
> > > >>> try: self.initialized
> > > >>> except AttributeError: print('first instantiation'); self.initialized
> > >
> > As per my recent foray into abusing existence-checking for Singleton
> > assurance
> > along such lines as
> >
> > >>> try: self.initialized
> > >>> except AttributeError: print('first instantiation'); self.initialized =
> > >>> True
> >
> > and then changing that to
> >
> > >>> try:
On Thu, 19 Oct 2023 at 18:25, Karsten Hilbert wrote:
>
> > > > Fundamentally no, at least not without some shenanigans. Type hints do
> > > > not affect the regular running of the code,
> > >
> > > Except when they do ;-)
> > >
> > > ... depending on what counts as (valid) code ...
> > >
> > > In
> > > Fundamentally no, at least not without some shenanigans. Type hints do
> > > not affect the regular running of the code,
> >
> > Except when they do ;-)
> >
> > ... depending on what counts as (valid) code ...
> >
> > In Python a distinction can be made between "runnable" and "valid" :-D
> >
On Thu, 19 Oct 2023 at 18:04, Karsten Hilbert wrote:
>
> > > or something like that. Basically, any way to avoid writing `= None` over
> > > and over again.
> >
> > Fundamentally no, at least not without some shenanigans. Type hints do
> > not affect the regular running of the code,
>
> Except
> > or something like that. Basically, any way to avoid writing `= None` over
> > and over again.
>
> Fundamentally no, at least not without some shenanigans. Type hints do
> not affect the regular running of the code,
Except when they do ;-)
... depending on what counts as (valid) code ...
In
On Thu, 19 Oct 2023 at 10:11, Matthew Carruth via Python-list
wrote:
>
> We have the `Optional[T]` type as a short-hand for Union[T | None] and
> telling us that said argument may not be present.
>
> However, I find that a majority of the time, we also want to set a default
> value of None on
