Issue #7111: Python can now be run without a stdin, stdout or stderr stream.
It was already the case with Python 2. However, the corresponding
sys module entries are now set to None (instead of an unusable file object).
diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 8167e78..2fca25e 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -291,6 +291,45 @@
rc, out, err = assert_python_ok('-c', code)
self.assertEqual(b'', err)
+ # Issue #7111: Python should work without standard streams
+
+ @unittest.skipIf(os.name != 'posix', "test needs POSIX semantics")
+ def _test_no_stdio(self, streams):
+ code = """if 1:
+ import os, sys
+ for i, s in enumerate({streams}):
+ if getattr(sys, s) is not None:
+ os._exit(i + 1)
+ os._exit(42)""".format(streams=streams)
+ def preexec():
+ if 'stdin' in streams:
+ os.close(0)
+ if 'stdout' in streams:
+ os.close(1)
+ if 'stderr' in streams:
+ os.close(2)
+ p = subprocess.Popen(
+ [sys.executable, "-E", "-c", code],
+ stdin=subprocess.PIPE,
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE,
+ preexec_fn=preexec)
+ out, err = p.communicate()
+ self.assertEqual(test.support.strip_python_stderr(err), b'')
+ self.assertEqual(p.returncode, 42)
+
+ def test_no_stdin(self):
+ self._test_no_stdio(['stdin'])
+
+ def test_no_stdout(self):
+ self._test_no_stdio(['stdout'])
+
+ def test_no_stderr(self):
+ self._test_no_stdio(['stderr'])
+
+ def test_no_std_streams(self):
+ self._test_no_stdio(['stdin', 'stdout', 'stderr'])
+
def test_main():
test.support.run_unittest(CmdLineTest)