[Cython] Bug in inplace operators?

[Robert Bradshaw]

Looks like a bug to me, thanks. http://trac.cython.org/cython_trac/ticket/732

On Tue, Sep 13, 2011 at 11:22 AM, Hagen Fürstenau <hagen at zhuliguan.net> wrote:
> Hi,
>
> I'm new to Cython, so I don't know if this is a bug, a known limitation, or
> a misunderstanding on my part, but the following simple example produces C
> code that fails to compile:
>
> -----------------------------------------------------------
> import numpy
> cimport numpy
>
> def f(numpy.ndarray[numpy.int32_t, ndim=1] a not None, i):
>    cdef numpy.ndarray[numpy.int32_t, ndim=1] b
>
>    b = numpy.ones(10, dtype=numpy.int32)
>    b[0] *= a[i]
>
>
> a = numpy.array([1, 2, 3], dtype=numpy.int32)
> f(a, 1)
> -----------------------------------------------------------
>
> Running this on Cython 0.15 and Python 3.2.2 with
>
> $ python -c 'import pyximport; pyximport.install(); import x'
>
> I get a compiler error, the essential part of which seems to be
>
> /export/home/hagenf/.pyxbld/temp.linux-x86_64-3.2/pyrex/x.c:1105: error:
> invalid operands to binary * (have ‘__pyx_t_5numpy_int32_t’ and ‘struct
> PyObject *’)
>
> The problem is in the line "b[0] *= a[i]". Replacing this with "b[0] = b[0]
> * a[i]" solves it. As does typing i as an int (which of course is a good
> idea anyway).
>
> Cheers,
> Hagen
>
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