On 20/06/17, Toshio Kuratomi wrote: > On Tue, Jun 20, 2017 at 6:06 AM, Kushal Das <mail@xxxxxxxxxxxx> wrote: > > Type annotations or type hints are purely for > > external type checking tools, they do not affect the Python interpreter > > anyway. > > Note that this statement is incorrect. Code like this: > https://docs.python.org/3/library/typing.html#user-defined-generic-types > where inheritance of a class from the typing module is used affects > running code. Mark Shannon gave a talk at the pycon language summit > and plead for the typing module to divorce type checking from > inheritance and pointed out that the implementation slows down > runtime. He further pointed out that using inheritance for type > information like this was not a proper fit; that sometimes the class > inherited from should not have anything to do with the type > information. Thanks for pointing this one out, I somehow missed both of Mark's talks in the language summit. Now, I went back and read the report on his talk[1]. I hope the core-denels will come up with solutions to the problem he pointed up in proper time. Thanks once again for pointing this one. [1] https://lwn.net/Articles/724639/ Kushal -- Fedora Cloud Engineer CPython Core Developer https://kushaldas.in https://dgplug.org _______________________________________________ infrastructure mailing list -- infrastructure@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to infrastructure-leave@xxxxxxxxxxxxxxxxxxxxxxx
