test_subprocess.py 文件源码

def test_communicate_timeout_large_ouput(self):
        # Test an expiring timeout while the child is outputting lots of data.
        p = subprocess.Popen([sys.executable, "-c",
                              'import sys,os,time;'
                              'sys.stdout.write("a" * (64 * 1024));'
                              'time.sleep(0.2);'
                              'sys.stdout.write("a" * (64 * 1024));'
                              'time.sleep(0.2);'
                              'sys.stdout.write("a" * (64 * 1024));'
                              'time.sleep(0.2);'
                              'sys.stdout.write("a" * (64 * 1024));'],
                             stdout=subprocess.PIPE)
        self.assertRaises(subprocess.TimeoutExpired, p.communicate, timeout=0.4)
        (stdout, _) = p.communicate()
        self.assertEqual(len(stdout), 4 * 64 * 1024)

    # Test for the fd leak reported in http://bugs.python.org/issue2791.