test_subprocess.py 文件源码

def test_io_buffered_by_default(self):
        p = subprocess.Popen([sys.executable, "-c", "import sys; sys.exit(0)"],
                             stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE)
        try:
            self.assertIsInstance(p.stdin, io.BufferedIOBase)
            self.assertIsInstance(p.stdout, io.BufferedIOBase)
            self.assertIsInstance(p.stderr, io.BufferedIOBase)
        finally:
            p.stdin.close()
            p.stdout.close()
            p.stderr.close()
            p.wait()