I'm pleased to announce v0.0.2 of my kwkeys package.
https://pypi.org/project/kwkey/
The main new feature is items-key duality. Based on that, it emulates the
semantics proposed by D'Aprano and van Rossum. It also emulates the
semantics proposed by myself.
What does this mean? Here, by duality I mean treating
items[key]
key[items]
as roughly equivalent. This allows us to move the keyword arguments outside
the square brackets.
In other words, the following
items[1, 2, a=3, b=4] = val
X(1, 2, a=3, b=4)[items] = val
are roughly equivalent. Here, X should implement the semantics one wishes
to use for
items[1, 2, a=3, b=4] =val
and the other item access methods (ie setitem and delitem).
I've already implemented three options for X. They are:
* class A: The current semantics
* class B: The semantics proposed by D'Aprano and van Rossum
* class C: The semantics proposed by Fine (ie myself)
and more can readily be provided. Experiments cost little.
Here's something nice. You can with current Python implement a class that
will work today via duality calls such as
X(1, 2, a=3, b=4)[items] = val
and after the implementation of PEP 637 the class will continue to work.
In other words, with post PEP 637 Python this
items[1, 2, a=3, b=4] =val
will work, provided you choose the value of X that Python implements.
For more information see
https://www.python.org/dev/peps/pep-0637/
https://pypi.org/project/kwkey/
https://github.com/jfine2358/python-kwkey
Guido: Apologies for calling you von Rossum in the README. I know you're
Dutch. I've already fixed it in the source. Perhaps next time I'll use the
safer GvR.
--
Jonathan
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