[Pyrex] instances of cdef'ed classes problem

[Stefan Behnel]

Hi,

Test Drive wrote:
> if you see the above example.

The example below, you mean.


> You will notice what I am trying to do.
> So basically i am trying to create an instance of Parrot class.

Which is not the problem.


> We write python wrappers for libraries so that we can use it as it is
> just python code.
> In the above case I will not be able to create an instance of the Parrot
> class in the python world.

Sure, it works perfectly, as your example shows.


> Actually i am struck with such a piece of code in the very similar fashion.
> I have a cdef'ed class with mixed def'ed and cdef'ed functions.
> I am able to see and use def'ed functions however not cdef'ed functions.

That's normal. As I said, 'cdef' defines them as C functions, not Python
functions. Read the docs. If you want Python functions, do not use 'cdef'.


> And i donot see a trivial workaround for that code.

And I do not see the problem.

Stefan


> On 7/6/06, * Stefan Behnel* <behnel_ml at gkec.informatik.tu-darmstadt.de
> <mailto:behnel_ml at gkec.informatik.tu-darmstadt.de>> wrote:
> 
>     Hi!
> 
>     Test Drive wrote:
>     > cdef class Parrot:
>     >
>     >   cdef void describe(self):
>     >     print "This parrot is resting."
>     >
>     > cdef class Norwegian(Parrot):
>     >
>     >   cdef void describe(self):
>     >     Parrot.describe(self)
>     >     print "Lovely plumage!"
>     >
>     > >>> p=parrot.Parrot()
>     > >>> p.decribe()
>     > Traceback (most recent call last):
>     >   File "<stdin>", line 1, in ?
>     > AttributeError: 'parrot.Parrot' object has no attribute 'decribe'
> 
>     obviously :)
> 
> 
>     > Now the problem is when i say dir(p)
>     >  i donot see the describe method, nor am i able to call it.
>     > Is it not possible to create an instance of cdef'ed class?
>     >
>     > any clues?
>     >
>     > thanks in adavnce
> 
>     Check your spelling before complaining? :)
>     Just kidding...
> 
>     Your method is a C method ("c"def!), so Python cannot see it. Make
>     it a normal
>     method without the "cdef" if you want to call it from Python.
> 
>     Stefan
> 
>