(Not sure why this is on python-ideas - wouldn't python-list be more
appropriate? Keeping it where it is for now though.)
On Thu, Jul 2, 2020 at 5:14 PM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
>
> The @property.getter and @property.setter decorators are
> clever, but they have the disadvantage that you end up
> writing the name of the property no less than 5 times,
> all of which have to match.
>
> Thinking there must be a better way, I came up with this:
>
> def Property(name, bases, dict):
> return property(dict.get('get'), dict.get('set'))
>
> which allows you to write
>
> class Test:
>
> class foo(metaclass = Property):
>
> def get(self):
> print("Getting foo")
> return self._foo
>
> def set(self, x):
> print("Setting foo to", x)
> self._foo = x
>
> test = Test()
> test.foo = 42
> print(test.foo)
>
> Output:
> Setting foo to 42
> Getting foo
> 42
>
I quite like the use of class blocks as namespaces, but I'm not a fan
of metaclassing. A decorated class is way cleaner in the source code.
How about this?
def Property(ns):
return property(*[getattr(ns, k, None) for k in ("fget", "fset",
"fdel", "__doc__")])
class Test:
@Property
class foo:
"""Docstring for foo"""
def fget(self):
print("Getting foo")
return self._foo
def fset(self, x):
print("Setting foo to", x)
self._foo = x
Same output as yours, and it's easy to support fdel, and a docstring.
ChrisA
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