[Tim]
>>>> See reply to Glenn. Can you give an example of a dotted name that is
>>>> not a constant value pattern? An example of a non-dotted name that is?
>>>> If you can't do either (and I cannot)), then that's simply what "if
[Rhodri James <rho...@kynesim.co.uk>]
>>> case long.chain.of.attributes:
[Tim]
>> That's a dotted name and so is a constant value pattern - read the PEP.
>>
>> Every dotted name in a pattern is looked up using normal Python
>> name resolution rules, and the value is used for comparison by
>> equality with the matching expression (same as for literals).
[Rhodri]
> Then I am surprised, which is worse. "long.chain.of.attributes" looks
> like an assignment target, and I would have expected the case to have
> been a name pattern.
As always, I don't care whether something is obvious at first glance.
I care whether something can be learned with reasonable effort, and
"sticks" _after_ it's learned. There's essentially nothing truly
obvious about programming.
This, from the PEP, is the entire grammar for a "name pattern'"
name_pattern: NAME !('.' | '(' | '=')
That's it. A plain name not followed by a dot, left paren, or equality sign.
While it may or may not surprise any given person at first glance,
it's very simple. Put a fraction of the effort into learning it as
you're willing to expend on articulating surprise, and it would
already be far behind you ;-)
_______________________________________________
Python-Dev mailing list -- python-dev@python.org
To unsubscribe send an email to python-dev-le...@python.org
https://mail.python.org/mailman3/lists/python-dev.python.org/
Message archived at
https://mail.python.org/archives/list/python-dev@python.org/message/HQHVWUA7TSDOOGJTK4CO32CS3TRHEMW6/
Code of Conduct: http://python.org/psf/codeofconduct/
