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 _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/eric%2Ba-python-dev%40trueblade.com
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