Experimental feature: add default argument to getattr().

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 85d8b3759366ae2546430bdfbead6669a53bcf30..727f8d19946eefdb7cdd72e9eb59317e3d7ad080 100644 (file)
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -669,18 +669,26 @@ builtin_getattr(self, args)
        PyObject *self;
        PyObject *args;
 {
-       PyObject *v;
+       PyObject *v, *result, *dflt = NULL;
        PyObject *name;
 
-       if (!PyArg_ParseTuple(args, "OS:getattr", &v, &name))
+       if (!PyArg_ParseTuple(args, "OS|O:getattr", &v, &name, &dflt))
                return NULL;
-       return PyObject_GetAttr(v, name);
+       result = PyObject_GetAttr(v, name);
+       if (result == NULL && dflt != NULL) {
+               PyErr_Clear();
+               Py_INCREF(dflt);
+               result = dflt;
+       }
+       return result;
 }
 
 static char getattr_doc[] =
-"getattr(object, name) -> value\n\
+"getattr(object, name[, default]) -> value\n\
 \n\
-Get a named attribute from an object; getattr(x, 'y') is equivalent to x.y.";
+Get a named attribute from an object; getattr(x, 'y') is equivalent to x.y.\n\
+When a default argument is given, it is returned when the attribute doesn't\n\
+exist; without it, an exception is raised in that case.";
 
 
 static PyObject *