Eric V. Smith <[email protected]> added the comment:
The fact that it's never been needed in the years that dataclasses and attrs
have existed tell me it's kind of a niche requirement.
This does not seem like the ugliest code I've ever seen:
if hasattr(super(), "__post_init__"):
super().__post_init__()
or the probably more efficient, but more lines of code:
try:
post_init = super().__post_init__
except AttributeError:
pass
else:
post_init()
As always with calling super functions, the whole hierarchy needs to cooperate.
Say you had a dataclass:
@dataclass
class Base:
def __post_init__(self, some_arg):
pass
How would an arbitrary derived class know how to call this? It can't. There has
to be knowledge of the base class's requirements already. Surely knowing
"__post_init__ must be called with some_arg" isn't too different from "I know
__post_init__ doesn't exist". I don't think adding ways to make the "always
call super" pattern easier is a good idea.
I'm still unconvinced, but I'll hold off on making a decision to see if there's
more support. Maybe taking it to python-ideas would be worthwhile.
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<https://bugs.python.org/issue46757>
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