On 12/21/17 6:25 AM, Sven R. Kunze wrote:
> On 21.12.2017 11:22, Terry Reedy wrote:
>>>>>> @dataclass
>>>> class C:
>>>> a: int # integer field with no default
>>>> b: float = 0.0 # float field with a default
>>>>>>>> And the types will be recognized by type checkers such as mypy.
>>>>>>>> And I think the non-typed examples should go first in the docs.
>>>> I still don't understand why "I don't care" can be defined by "leaving out"
>> @dataclass
> class C:
> b = 0.0 # float field with a default
Because you can't know the order that x and y are defined in this example:
class C:
x: int
y = 0
'x' is not in C.__dict__, and 'y' is not in C.__annotations__.
Someone will suggest a metaclass, but that has its own problems. Mainly,
interfering with other metaclasses.
Eric.
>>> For non-default fields, I like ellipsis too.
>> Cheer,
> Sven
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