[Python-ideas] True and False are singletons

[David Mertz]

It was a VERY long time ago when True and False were not singletons. I
don't think we should still try to write code based on rules that stopped
applying more than a decade ago.

On Mon, Mar 18, 2019, 5:42 PM Greg Ewing <greg.ewing at canterbury.ac.nz>
wrote:

> Oleg Broytman wrote:
> >    Three-way (tri state) checkbox. You have to distinguish False and
> > None if the possible valuse are None, False and True.
>
> In that case the conventional way to write it would be
>
>      if settings[MY_KEY] == True:
>          ...
>
> It's not a major issue, but I get nervous when I see code
> that assumes True and False are unique, because things
> weren't always that way.
>
> --
> Greg
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