diff -r 31301b84ac8d Python/pythonrun.c
--- a/Python/pythonrun.c	Wed Jun 03 11:05:57 2015 -0700
+++ b/Python/pythonrun.c	Wed Jun 03 16:51:04 2015 -0700
@@ -108,6 +108,15 @@
         Py_XDECREF(v);
     }
     err = -1;
+    
+    PyRun_SimpleString("import warnings as __Py_temporary_warnings\n"
+                       "import sys as __Py_temporary_sys\n"
+                       "if __Py_temporary_sys.stdin.isatty():\n"
+                       "\t__Py_temporary_warnings.filterwarnings('default',\n"
+                       "\t\tcategory=DeprecationWarning, module='__main__')\n"
+                       "del __Py_temporary_warnings\n"
+                       "del __Py_temporary_sys");
+
     for (;;) {
         ret = PyRun_InteractiveOneObject(fp, filename, flags);
         _PY_DEBUG_PRINT_TOTAL_REFS();