On 26/06/20 6:21 am, Pablo Galindo Salgado wrote:
Which means that users can do a positional match against the proxy with
a name pattern:
match input:
case datetime.date(dt):
print(f"The date {dt.isoformat()}"
I think that would be an incorrect way for matching on datetime
to behave. Since datetime has a constructor that takes positional
arguments, it should have a __match__ and/or __match_args__
that agrees.
This suggests that there will be a burden on many existing types
to ensure they implement appropriate matching behaviour, as the
default behaviour provided by object will be wrong for them.
I'm wondering whether the default "single positional match"
behaviour is a bad idea. I.e. the only thing that should work
by default is
case someclass():
and not
case someclass(instance):
Classes such as int with constructors that can take a single
argument should be required to implement the corresponding
match behaviour explicitly.
--
Greg
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