On Tue, Jun 19, 2018 at 8:12 PM, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote: > On Mon, 18 Jun 2018 11:34:40 -0700, Jim Lee wrote: > >> On 06/18/2018 11:18 AM, Chris Angelico wrote: >>> What, fundamentally, is the difference between type hints and >>> assertions, such that - in >>> your view - one gets syntax and the other is just comments? >> Type hints are just that - hints. They have no syntactic meaning to the >> parser, and do not affect the execution path in any way. Therefore, they >> are effectively and actually comments. The way they have been >> implemented, though, causes noise to be interspersed with live code and, >> as others have said, are difficult to remove or ignore. > > So let me get this straight... > > Using annotations is evil, because it intersperses noise with live code: > > def function(argument: int, > flag: bool, > sequence: list) -> str: > ... > > > But using comments is great, because it doesn't: > > def function(argument, # type=int, > flag, # type=bool, > sequence, # type=list): # type=str > ... > > > Okay, I'm glad we cleared that up. >
Isn't it nice how comments, being terminated exclusively by end-of-line, allow the introduction of subtle bugs? Let's see how many people spot the (presumably deliberate) bug in Steve's code here. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
