Hi Maarten,
On 10 Sep., 15:32, Maarten Derickx <m.derickx.stud...@gmail.com>
wrote:
> You should really learn about metaclasses. The basically allow you to change
> the way classes are created. Normally this is done by type. I.e. the
> following are equivalent.
>
> sage: class Foo(object):
> ....: def a(self):
> ....: return 1
> ....:
> sage: f=Foo()
> sage: f.a()
> 1
>
> sage: Foo=type('Foo',(object,),{'a':lambda self: 1})
> sage: f=Foo()
> sage: f.a()
> 1
Yes, that's about as far as I came. But I'm having problems to do the
same in Cython. And that's essential, since it is about speed:
sage: cython("""
....: def a(self):
....: return id(self)
....: """)
sage: Foo=type('Foo',(object,),{'a':a})
sage: f=Foo()
sage: f.a()
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/king/SAGE/work/fast_hash/<ipython console> in <module>()
TypeError: a() takes exactly one argument (0 given)
The difference is that in your pure Python example, you get
sage: f.a
<bound method Foo.<lambda> of <__main__.Foo object at 0x56bee90>>
However, if one starts with a Python function written in Cython, one
gets
sage: f.a
<built-in function a>
How can one achieve that self is passed to the function?
I also know that binding can be mimmicked with a __get__ method.
However, that is too slow as well.
Best regards,
Simon
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