Multiple alternatives validator #1214
Description
I'd like to validate that a field can be of several types, one of which is an iterator.
from attrs.validator import instance_of
@define
class C:
x: A | B | tuple[int, ...] = field(validator=instance_of((A, B, tuple)))I can use instance_of to check the outer type tuple, but I can't use deep_iterable to validate that they are indeed the element type int.
Since we already have validators and_ and not_, it may make sense to also add or_, so that I can represent this with
from attrs.validator import instance_of, deep_iterable, or_
@define
class C:
x: A | B | tuple[int, ...] = field(
validator=or_(
instance_of((A, B)),
deep_iterable(instance_of(int))))For comparison, this is how I'm writing a custom validator
from attrs.validator import instance_of, deep_iterable
@define
class C:
x: A | B | tuple[int, ...] = field()
@x.validator
def _validate_x(self, attr, value):
v1 = instance_of((A, B))
v2 = deep_iterable(instance_of(int))
try:
v1(self, attr, value)
except TypeError:
v2(self, attr, value)