On 2021-08-08 at 11:30:20 +0400,
Abdulla Al Kathiri <[email protected]> wrote:
> ... if we write “case” before “def” similar to “async” before “def” in
> async function it should be clear we are doing pattern matching. The
> function will be named case function.
>
> case def fib(0):
> return 0
>
> case def fib(1):
> return 1
>
> case def fib(int(n)):
> return fib(n-1) + fib(n-2)
>
> If you none of the parameters you pass match your case functions, an
> exception will be raised ...
Because the order of cases is significant, these would be difficult to
work with in the REPL. If, for example, I start with your three
definitions, and then decide to write a special case¹ for 2, how do I
convince Python that
case def fib(2):
return 1
belongs before the general case?
¹ Yeah, I know, special cases aren't special enough. In a non-toy case
(pun intended), there could be any number of reasons to add a new case
in the middle, or to redfine/fix a case that already exists rather than
add a new case to the end.
_______________________________________________
Python-ideas mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/[email protected]/message/4OWHKTPCNJML7Y5GRKI3DP2KBUFKDZKI/
Code of Conduct: http://python.org/psf/codeofconduct/
