最后一次提交时间：2025-07-09 10:01:21 得分：0.00 JSON格式错误! Traceback (most recent call last): File "coursegrader/dockerext/checkpoint_test.py", line 350, in run() File "coursegrader/dockerext/checkpoint_test.py", line 259, in run subprocess.run(cmd, stdout=outfile, stderr=outfile, shell=True) File "/usr/lib/python3.6/subprocess.py", line 423, in run with Popen(*popenargs, **kwargs) as process: File "/usr/lib/python3.6/subprocess.py", line 687, in __init__ errread, errwrite) = self._get_handles(stdin, stdout, stderr) File "/usr/lib/python3.6/subprocess.py", line 1204, in _get_handles c2pwrite = stdout.fileno() ValueError: I/O operation on closed file