Index: Python/pythonrun.c
===================================================================
--- Python/pythonrun.c	(révision 67065)
+++ Python/pythonrun.c	(copie de travail)
@@ -884,6 +884,22 @@
 		return PyRun_SimpleFileExFlags(fp, filename, closeit, flags);
 }
 
+static void
+PyRun_InteractiveCleanup(void)
+{
+	PyObject *value, *dict;
+	PyInterpreterState *interp = PyThreadState_GET()->interp;
+	PyObject *modules = interp->modules;
+
+	value = PyDict_GetItemString(modules, "builtins");
+	if (value != NULL && PyModule_Check(value)) {
+		dict = PyModule_GetDict(value);
+		if (Py_VerboseFlag)
+			PySys_WriteStderr("# clear builtins._\n");
+		PyDict_SetItemString(dict, "_", Py_None);
+	}
+}
+
 int
 PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)
 {
@@ -908,13 +924,19 @@
 	for (;;) {
 		ret = PyRun_InteractiveOneFlags(fp, filename, flags);
 		PRINT_TOTAL_REFS();
-		if (ret == E_EOF)
-			return 0;
+		if (ret == E_EOF) {
+			ret = 0;
+			break;
+		}
 		/*
-		if (ret == E_NOMEM)
-			return -1;
+		if (ret == E_NOMEM) {
+			ret = 1;
+			break;
+		}
 		*/
 	}
+	PyRun_InteractiveCleanup();
+	return ret;
 }
 
 /* compute parser flags based on compiler flags */