I fixed the docstring inconsistency (see patch) and some obvious things.

But I still have errors.


~ $ python3 -m doctest py3_failed/subprocess.py
**********************************************************************
File "py3_failed/subprocess.py", line 139, in subprocess
Failed example:
    subprocess.getstatusoutput('/bin/junk')
Expected:
    (256, 'sh: /bin/junk: not found')
Got:
    (32512, '/bin/sh: /bin/junk: No such file or directory')
**********************************************************************
File "py3_failed/subprocess.py", line 449, in subprocess.check_output
Failed example:
    check_output(["ls", "-l", "/dev/null"])
Expected:
    b'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'
Got:
    b'crw-rw-rw- 1 root root 1, 3 Nov 15 17:41 /dev/null\n'
**********************************************************************
File "py3_failed/subprocess.py", line 455, in subprocess.check_output
Failed example:
    check_output(["/bin/sh", "-c",
                  "ls -l non_existent_file ; exit 0"],
                  stderr=STDOUT)
Expected:
    b'ls: non_existent_file: No such file or directory\n'
Got:
    b'ls: cannot access non_existent_file: No such file or directory\n'
**********************************************************************
File "py3_failed/subprocess.py", line 559, in subprocess.getstatusoutput
Failed example:
    subprocess.getstatusoutput('/bin/junk')
Expected:
    (256, 'sh: /bin/junk: not found')
Got:
    (32512, '/bin/sh: /bin/junk: No such file or directory')
**********************************************************************
3 items had failures:
   1 of   6 in subprocess
   2 of   2 in subprocess.check_output
   1 of   4 in subprocess.getstatusoutput
***Test Failed*** 4 failures.
~ $