On Apr 28, 2008, at 1:34 PM, Brian Blais wrote:
>
> On Apr 28, 2008, at Apr 28:3:13 PM, Robert Bradshaw wrote:
>
>> You need to write
>>
>> mything.doit = classmethod(testit.doit)
>>
>> - Robert
>>>
>
>
> thanks, but now I get a different error. :) It feels like I am
> missing some bit of python "magic", which I find annoying given
> that usually python is "the way I think is the way it is".
Yes, the way Python deals with (bound/unbound) instance methods,
functions, builtin methods, etc. is not one of the most transparent
parts of Python... I misspoke when I said use classmethod. What you
nee do to is
import types
mything.doit = types.MethodType(testit.doit, None, mything)
Don't ask me how you were supposed to figure this out short of being
intimately familiar with how Python internals work...
- Robert
>
>
> thanks again,
>
>
> bb
>
> The full error is:
>
> ----------------------------------------------------------------------
> -----
> AttributeError Traceback (most recent
> call last)
>
> /Users/bblais/python/testit.py in <module>()
> 22
> 23 a=mything(10)
> ---> 24 print a.doit(50)
> 25
> 26
>
> /Users/bblais/python/c_testit.so in c_testit.doit (c_testit.c:216)()
> ----> 1
> 2
> 3 cpdef doit(object self,int x):
> 4
> 5 cdef int i
> 6 cdef int N=self.N
> 7 cdef int val
>
> /Users/bblais/python/c_testit.so in c_testit.doit (c_testit.c:137)()
> 2
> 3 cdef int i
> ----> 4 cdef int N=self.N
> 5 cdef int val
> 6
>
> AttributeError: type object 'mything' has no attribute 'N'
> WARNING: Failure executing file: <testit.py>
>
>
> The code is:
>
> =============================
> #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=classmethod(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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