On Sun, Dec 12, 2021 at 4:06 AM Christopher Barker <python...@gmail.com> wrote: > Here’s a new (not well thought out) idea: > > @dataclasses.dataclass > class A: > Input_list: list > length: int => len(input_list) > > So length gets set to a “late bound default expression” that Is an actual > value. It would have to store the expression itself, probably as a string, > and it would get evaluated in the namespace of the function, when the > function was called. So the generated __init__ would be the same as: > > def __init__(self, input_list, length=>len(input_list):
If I'm not mistaken, dataclasses generate __init__ using exec anyway, so this would work with a plain string. ChrisA _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/26KTI6DXSB5GJBXEHHFXZEW3222NVWWK/ Code of Conduct: http://python.org/psf/codeofconduct/
