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Wed Sep 15 17:35:36 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-September/048926.html

Thomas Heller wrote:
> Can anyone explain why calling this code in a C extension
> 
> static PyObject *
> test(PyObject *self, PyObject *arg)
> {
>         PyErr_SetString(PyExc_UnicodeDecodeError, "blah blah");
>         return NULL;
> }
> 
> PyMethodDef module_methods[] = {
>         {"test", test, METH_NOARGS},
>         {NULL, NULL}
> };
> 
> 
> does this (same in 2.3.4, and 2.4 current CVS):
> 
> 
>>>>from somewhere import test
>>>>test()
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: function takes exactly 5 arguments (1 given)
> 

See Python/exceptions.c:

PyObject * PyUnicodeDecodeError_Create(
	const char *encoding, const char *object, int length,
	int start, int end, const char *reason)
{
     return PyObject_CallFunction(PyExc_UnicodeDecodeError, "ss#iis",
	encoding, object, length, start, end, reason);
}

This exception is thrown by codecs that want to signal a
decoding error. It includes the context of the problem as
well as the reason string.

-- 
Marc-Andre Lemburg
eGenix.com

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[Python-Dev] PyExc_UnicodeDecodeError