Re: <build-in function> incompatible with <function>

Luke wrote:
> Built-in functions don't bind to classes like regular functions. Is
> this intended? (I do notice that the Python Reference Manual sec 3.2
> under "Class Instance" refers to a "user-defined function"). Any ideas
> what the reason is for this distinction between build-in functions and
> normal functions?
>
> It's rather inconvenient when implementing some methods (not the whole
> class) in a C extension :-(
>
> $ python
> Python 2.4.2 (#1, Nov 3 2005, 12:41:57)
> [GCC 3.4.3-20050110 (Gentoo Linux 3.4.3.20050110, ssp-3.4.3.20050110-0,
> pie-8.7 on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>>>>def normal_func(x):
>
> ... return x
> ...
>
>>>>class foo(object):
>
> ... a = normal_func
> ... b = lambda x : x
> ... c = abs
> ...
>
>>>>obj = foo()
>>>>obj.a
>
> <bound method foo.normal_func of <__main__.foo object at 0xb7c3766c>>
>
>>>>obj.b
>
> <bound method foo.<lambda> of <__main__.foo object at 0xb7c3766c>>
>
>>>>obj.c
>
> <built-in function abs>
>

py> import types
py> def doit(x):
... print x
...
py> class bob:
... pass
...
py> b = bob
py> b.x = types.MethodType(doit, b)
py> b.x
<bound method ?.doit of <class __main__.bob at 0x403d8b3c>>
py> b.x()
__main__.bob
Received on Tue Feb 7 20:18:08 2006