diff -r 51e7c9b54f56 Lib/test/test_sys.py
--- a/Lib/test/test_sys.py	Tue Jan 31 13:56:50 2017 +0100
+++ b/Lib/test/test_sys.py	Wed Feb 01 18:14:08 2017 +0000
@@ -164,6 +164,17 @@
 self.assertEqual(out, b'')
 self.assertEqual(err, b'')
 
+ # test that the exit machinery handles long exit codes
+ rc, out, err = assert_python_failure('-c', 'raise SystemExit(47L)')
+ self.assertEqual(rc, 47)
+ self.assertEqual(out, b'')
+ self.assertEqual(err, b'')
+
+ rc, out, err = assert_python_ok('-c', 'raise SystemExit(0L)')
+ self.assertEqual(rc, 0)
+ self.assertEqual(out, b'')
+ self.assertEqual(err, b'')
+
 def check_exit_message(code, expected, **env_vars):
 rc, out, err = assert_python_failure('-c', code, **env_vars)
 self.assertEqual(rc, 1)
diff -r 51e7c9b54f56 Misc/NEWS
--- a/Misc/NEWS	Tue Jan 31 13:56:50 2017 +0100
+++ b/Misc/NEWS	Wed Feb 01 18:14:08 2017 +0000
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #14376: Allow sys.exit to accept longs as well as ints. Patch
+ by Gareth Rees.
+
 - Issue #29145: Fix overflow checks in string, bytearray and unicode.
 Patch by jan matejek and Xiang Zhang.
 
diff -r 51e7c9b54f56 Python/pythonrun.c
--- a/Python/pythonrun.c	Tue Jan 31 13:56:50 2017 +0100
+++ b/Python/pythonrun.c	Wed Feb 01 18:14:08 2017 +0000
@@ -1127,7 +1127,7 @@
 /* If we failed to dig out the 'code' attribute,
 just let the else clause below print the error. */
 }
- if (PyInt_Check(value))
+ if (PyInt_Check(value) || PyLong_Check(value))
 exitcode = (int)PyInt_AsLong(value);
 else {
 PyObject *sys_stderr = PySys_GetObject("stderr");
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