On 2020-02-09 9:44 a.m., Eric V. Smith wrote:
On 2/9/2020 7:34 AM, Soni L. wrote:
I propose that:
def foo(print(x)):
pass
becomes:
def foo(x):
x = print(x)
pass
or, alternatively we could have decorators in function args:
def foo(@print x):
pass
which would probably be more aligned with the rest of python actually.
anyway, this would be nice I think. I could really use it.
I'm having a hard time imagining where this would be useful. Could you
give a concrete example where it would make some code clearer? Surely
you wouldn't use it with print(), which returns None.
Of course not. It'd be useful with traits.
Turn this:
from traitobject import Trait, TraitObject, impl
class MyTrait(Trait):
def x(self):
raise NotImplementedError
class MyClass(TraitObject):
@impl(MyTrait)
class MyTrait:
def x(self):
print("Hello,")
self.x()
def x(self):
print("World!")
def my_fn(x):
x = MyTrait(x)
x.x()
my_fn(MyClass())
into this:
from traitobject import Trait, TraitObject, impl
class MyTrait(Trait):
def x(self):
raise NotImplementedError
class MyClass(TraitObject):
@impl(MyTrait)
class MyTrait:
def x(self):
print("Hello,")
self.x()
def x(self):
print("World!")
def my_fn(@MyTrait x):
x.x()
my_fn(MyClass())
(this may not be "real code" but it's one of the test cases in my trait
lib project)
Eric
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