[Python-Dev] negative PyLong integer -> unsigned integer, TypeError or OverflowError?

[Lisandro Dalcin]

While hacking on Cython to make it recognize 'size_t' as a pre-defined
C integral type, I've found somethig that seems to be (pretty small)
inconsistency.

At Objects/longobject.c, you should see that in almost all cases
OverflowError is raised when a unsigned integral is requested from a
negative PyLong. However, See this one:

int
_PyLong_AsByteArray(PyLongObject* v,
                   unsigned char* bytes, size_t n,
                   int little_endian, int is_signed)
{
<...>
               if (!is_signed) {
                       PyErr_SetString(PyExc_TypeError,
                               "can't convert negative long to unsigned");
                       return -1;
               }
<...>
}

Does it make sense to change that code to raise OverflowError?


-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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