Nice work, very usefull.
Is it interesting enough to note that the negation of None is True?
(probably just because when it's casted to bool, it becomes False).
Also, even if None is seen as the value for the lack of value, it is
still hashable and can be used as a key to a dict (I'm not saying it's
always good practice!):
>>> def f():
... pass
...
>>> {None: 5, not None: 6}
{None: 5, True: 6}
>>> {f(): 4}
{None: 4}
Also, I would probably have added an example of how (and why) to use a
sentinel value for when None has a meaning other than [not provided] in
a function's signature.
You'll see if any of these is worth integrating.
- Brice
Le 14/08/2018 à 12:28, Jonathan Fine a écrit :
Hi
I'm pleased to announce that I've completed the first draft of my
page. It's viewable on gitub.
https://github.com/jfine2358/py-jfine2358/blob/master/docs/none-is-special.md
To quote from that page:
This page arose from a thread on the python-ideas list. I thank Steve
Dower, Paul Moore, Steve D'Aprano, Chris Barker, David Mertz, Jörn
Heissler, Anthony Risinger, Michael Selik, Chris Angelico for their
contributions and encouragement.
Apologies for anyone I've missed. Comments either on python-ideas, or
perhaps better, by raising an issue on github.
_______________________________________________
Python-ideas mailing list
Python-ideas@python.org
https://mail.python.org/mailman/listinfo/python-ideas
Code of Conduct: http://python.org/psf/codeofconduct/
