Thomas Wouters schrieb:
This is because a bytes object is not a sequence of bytes objects, like
strings. It's a sequence of small integer values, so you need to assign
a small integer value to it. You can assign b'a'[0] to it, or assign
b'a' to x[:1]. I guess we could specialcase length-1 bytes to make this
work 'naturally', but I'm not sure that's the right approach. Guido?
If it is deemed right, see attached patch.
BTW, is it intentional that the setitem/setslice code is duplicated in
bytesobject.c?
Georg
Index: Objects/bytesobject.c
===================================================================
--- Objects/bytesobject.c (Revision 53912)
+++ Objects/bytesobject.c (Arbeitskopie)
@@ -451,7 +451,18 @@
slicelen = 1;
}
else {
- Py_ssize_t ival = PyNumber_AsSsize_t(values, PyExc_ValueError);
+ Py_ssize_t ival;
+ /* if the value is a length-one bytes object, assign it */
+ if (PyBytes_Check(values)) {
+ if (PyBytes_GET_SIZE(values) != 1) {
+ PyErr_SetString(PyExc_ValueError, "cannot assign bytes "
+ "object of length != 1");
+ return -1;
+ }
+ self->ob_bytes[i] = ((PyBytesObject *)values)->ob_bytes[0];
+ return 0;
+ }
+ ival = PyNumber_AsSsize_t(values, PyExc_ValueError);
if (ival == -1 && PyErr_Occurred())
return -1;
if (ival < 0 || ival >= 256) {
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