New submission from Eric V. Smith <e...@trueblade.com>: Modify dataclasses to make it easier to specify special methods.
For example: currently, if you want to override __repr__, you need to specify @dataclass(repr=False), and also provide your own __repr__. Also, it's current an error to not specify repr=False and to also provide your own __repr__. @dataclass should be able to determine that if you provide __repr__, you don't want it to provide it's own __repr__. The methods that @dataclass will provide for you are: __init__ __repr__ __eq__ __ne__ __lt__ __le__ __gt__ __ge__ _hash__ and if using frozen=True, also: __setattr__ __delattr__ Per the discussion that started at https://mail.python.org/pipermail/python-dev/2017-December/151487.html, the change will be to override these methods only if: 1. the method would have been generated based on @dataclass params, and 2. the method is not present in the class's __dict__. The first item is to allow the user to continue to suppress method generation, and the second item is so that base-class methods are not considered in the decision. I'm still thinking through how __eq__ and __ne__ should be handled (as well as the ordering comparisons, too). I'll raise an issue on python-dev and point it here. ---------- assignee: eric.smith messages: 309628 nosy: eric.smith priority: normal severity: normal status: open title: dataclasses: make it easier to use user-supplied special methods type: behavior versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32513> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
