[Pyrex] How to use C functions in many Pyrex files?

[Tomasz Primke]

> What Josiah is recommending is to use the Pyrex "include" capability,
> which will essentially include the source of the other module verbatim.
> You will thus end up with two copies of the same code (one in each
> module).

And that's why I don't like the idea.

> <snip>
>
> Another method is to create an extension type, put your C function
> as a method of the extension type, create a pxd file, and use
> cimport.  (All described in
> http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/version/Doc/sharing.h
>tml).

I tried it, but I failed. I did it as follows:

--- p1.pxd ---
cdef class SomeClass:
  cdef public void C_function( int i )

--- p1.pyx ---
cdef class SomeClass:
  cdef public void C_function( int i ):
    ...

cdef public SomeClass instance  # I have also tried without "cdef public",
				# but with the same result
instance = SomeClass()

--- p2.pyx ---
cimport p1
import p1

def fun( int i ):
  p1.instance.C_function( i )


It had compiled, but then I tried:

>>> import p2
>>> p2.fun( 1 )
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "p2.pyx", line 5, in p2.fun
    p1.instance.C_function( i )
AttributeError: 'module' object has no attribute 'instance'

So I decided to find a different solution.


So far, the only way to "work around" this problem was to write a Python 
function wrapper for the C one in p1 module:

--- p1.pyx ---
cdef C_function( int i ):
  ...

def Cfun( int i ):
  C_function( i )


--- p2.pyx ---
import p1

# now it's possible to call the p1.Cfun function


It was the only solution, that worked. So far I'm happy with that, but I 
wouldn't mind, if some more convenient way is developed.


Thank you all for your help.


Best regards,

	Tomek