duncan smith wrote:
> On 02/12/2018 18:36, Peter Otten wrote:
>> class CommonMethods:
>> __add__ = add
> Ah, I could just bind them within the class,
>
> mean = mean
> max = max etc.
>
> but I'd somehow convinced myself that didn't work. As the names are the
> same I'd probably still prefer to go with something along the lines of
>
> for name in ['mean', 'max', ...]:
> # create a method
>
> But at least I now have something that works, and I could try something
> like your suggestion above to see if I prefer it.
>
> The issue was that some of these "functions" are actually callable class
> instances (an attempt to emulate numpy's ufuncs).
For these to work you need to implement the "descriptor protocol", something
like
$ cat tmp.py
from functools import partial
class Add:
def __call__(self, left, right):
return 42 + right
def __get__(self, inst=None, class_=None):
if inst is None:
return self
return partial(self.__call__, inst)
class Demo:
__add__ = Add()
x = Demo()
print(x + 100)
$ python3 tmp.py
142
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