PyAPI: move deep-copy args check to py_capi_utils

source/blender/python/generic/py_capi_utils.c

@@ -230,6 +230,12 @@ int PyC_ParseBool(PyObject *o, void *p)
 	return 1;
 }
 
+/* silly function, we dont use arg. just check its compatible with __deepcopy__ */
+int PyC_CheckArgs_DeepCopy(PyObject *args)
+{
+	PyObject *dummy_pydict;
+	return PyArg_ParseTuple(args, "|O!:__deepcopy__", &PyDict_Type, &dummy_pydict) != 0;
+}
 
 #ifndef MATH_STANDALONE
 

source/blender/python/generic/py_capi_utils.h

@@ -106,6 +106,7 @@ bool PyC_RunString_AsString(const char *expr, const char *filename, char **r_val
 
 int PyC_ParseBool(PyObject *o, void *p);
 
+int PyC_CheckArgs_DeepCopy(PyObject *args);
 
 /* Integer parsing (with overflow checks), -1 on error. */
 int     PyC_Long_AsBool(PyObject *value);