On Apr 28, 2008, at 11:55 AM, Brian Blais wrote:
> Hello,
>
> I must be missing something minor but I just can't figure it out. I
> am trying to replace a method in a class with a cdef function defined
> in cython, but keep getting the error:
>
> TypeError: function takes exactly 2 arguments (1 given)
>
>
> I include an example to reproduce the issue, with the .py file and
> the .pyx file, below. Any help would be great!
Somehow, when you do
class spam:
pass
spam.eggs = foo
Foo gets magically turned into a classmethod if it is a python
function, but not if it is a "builtin" python function. (Seems like
poor design to me.) To see this in pure Python, do
spam.len = len
spam().len()
which will be a similar error. You need to write
mything.doit = classmethod(testit.doit)
- Robert
>
>
> thanks,
>
> Brian Blais
>
> testit.py
> =========
> class mything(object):
>
> def __init__(self,N):
> self.N=N
>
> def doit(self,x):
>
> val=0
> for i in range(self.N,x):
> val+=i
>
> return val
>
> try:
> import c_testit
> mything.doit=c_testit.doit
> print "Using cython version"
> except ImportError:
> pass
>
> if __name__=="__main__":
>
> a=mything(10)
> print a.doit(50)
>
>
> c_testit.pyx
> ============
> cpdef doit(object self,int x):
>
> cdef int i
> cdef int N=self.N
> cdef int val
>
> val=0
> for i from N<=i<x:
> val+=i
>
> return val
>
>
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