On 12/11/2021 12:11 PM, Chris Angelico wrote:
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.
The current version does, but I've produced previous versions that
don't. They built up the AST themselves and use eval() on that.
Eric
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