[Python-ideas] True and False are singletons

Greg Ewing greg.ewing at canterbury.ac.nz
Mon Mar 18 16:58:55 EDT 2019

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.


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