Cython cannot convert to int?

Question

using Anaconda, Python 3.4 and Win7 64bit, i can't get this running:

C Code:

    int addInts(int a, int b)
{
    return a+b;
}

PYX file:

cdef extern from "square.cpp":
    int addInts(int, int)

def pAddInts(int a, int b):
    return addInts(a, b)

and testfile:

res = callCpp.pAddInts(3, 4)

error message:

Traceback (most recent call last):
  File "testScript.py", line 9, in <module>
    res = callCpp.pAddInts(a, b)
  File "callCpp.pyx", line 16, in callCpp.pAddInts (callCpp.cpp:952)
    def pAddInts(int a, int b):
TypeError: __int__ returned non-int (type int)

No problems @all with double and double*, but ints don't work.. Whats the problem here? Thanks!

It might be helpful to give the compiler you're using (I don't know if it's relevant but it could be). Also you should probably be doing `cdef extern from "square.hpp"` (i.e. the header file without the implementation). However, I doubt that's the problem. I can't reproduce the bug though, so don't think I can actually help. — DavidW, May 13 '15 at 10:29
Anaconda uses the gcc (which is included). The problem also occurs without any C-function call, even if i just assign the python int to a cdef int. — mneuner, May 13 '15 at 10:37

score 0 · Accepted Answer · answered May 13 '15 at 11:24

0

Ok got the solution: mingw is NOT suitable for this job, it has to be Microsoft VC++. This helped perfectly: https://github.com/cython/cython/wiki/InstallingOnWindows

answered May 13 '15 at 11:24

mneuner

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Cython cannot convert to int?

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