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Paste from smoser at Mon, 10 Jul 2017 18:25:00 +0000

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$ python3 -c 'import subprocess; subprocess.check_output("/bin/false")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/subprocess.py", line 316, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.5/subprocess.py", line 398, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '/bin/false' returned non-zero exit status 1
$ python3 -c 'import subprocess; subprocess.check_output("/bin/non-existant")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/subprocess.py", line 316, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.5/subprocess.py", line 383, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.5/subprocess.py", line 676, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.5/subprocess.py", line 1283, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: '/bin/non-existant'
$ head -c 24 /dev/urandom > foo
$ chmod 755 foo
$ python3 -c 'import subprocess; subprocess.check_output("./foo")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/subprocess.py", line 316, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.5/subprocess.py", line 383, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.5/subprocess.py", line 676, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.5/subprocess.py", line 1283, in _execute_child
    raise child_exception_type(errno_num, err_msg)
OSError: [Errno 8] Exec format error
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