Boris Borcic wrote:
Given the ABC innovation, maybe an infix syntax for isinstance() would
be good.
Possibilities :
- stealing "is" away from object identity. As a motivation, true use
cases for testing object identity are rare; forcing the usage of a
function or method to test it, would dissuade abuse.
- allowing containment tests, ie "x in Number" to invoke isinstance() in
the background when the container is of type <type>. My brain is too
muddled by flu at the moment, to see whether Guido's fabled time machine
allowed him to already provide all the necessities in py26.
Any takers ?
I believe this could be done by adding a __contains__ method to type.
(It does not have one now). Then x in X should work for all classes
that are instances of type or a subclass thereof.
- combining both keywords to create a third one, eg "is in"
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