I'd like to see traits some day, with a syntax similar to this one:
trait Trait:
def x(self):
raise NotImplementedError
def y(self):
raise NotImplementedError
trait Anoher:
def x(self):
raise NotImplementedError
def y(self):
raise NotImplementedError
def foo(Trait(x)):
x.x()
class Bar:
def y(self):
print("hello")
impl Trait:
def x(self):
self.y() # resolves to Bar.y
impl Another:
def x(self):
raise ValueError
foo(Bar()) # prints 'hello'
Trait(Bar()).x() # also prints 'hello'
Bar().x() # AttributeError: ambiguous reference to trait method x
if the trait isn't used in the function definition you get the raw
object, where name conflicts between traits (but not between traits and
inherent methods) result in an error about name conflicts. otherwise you
get a friendly wrapper.
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