Python 3.6.4 (default, Jan 3 2018, 21:10:22) [GCC 4.8.4] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import subprocess >>> subprocess.call('nonexistent') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.6/subprocess.py", line 267, in call with Popen(*popenargs, **kwargs) as p: File "/usr/local/lib/python3.6/subprocess.py", line 709, in __init__ restore_signals, start_new_session) File "/usr/local/lib/python3.6/subprocess.py", line 1344, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] No such file or directory: 'nonexistent': 'nonexistent' Note that the name of the missing file is mentioned twice in the error message. (Strictly speaking it's once in the message, and once in the filename attribute, but for a casual observer, the effect is the same.)

This code was added in issue4925. Is the original problem gone?

The builtin exception is better now, so I don't see a problem with reverting the original patch.

 New changeset 73870bfeb9cf350d84ee88bd25430c104b3c6191 by Benjamin Peterson (Zackery Spytz) in branch 'master': closes bpo-32490: Fix filename duplication in subprocess exception message. (GH-9163) https://github.com/python/cpython/commit/73870bfeb9cf350d84ee88bd25430c104b3c6191 

There was also some relevant discussion in #22536.