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========
run(...): Runs a command, waits for it to complete, then returns a
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Popen(...): A class for flexibly executing a command in a new process
Constants
---------
DEVNULL: Special value that indicates that os.devnull should be used
PIPE: Special value that indicates a pipe should be created
STDOUT: Special value that indicates that stderr should go to stdout
Older API
=========
call(...): Runs a command, waits for it to complete, then returns
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check_call(...): Same as call() but raises CalledProcessError()
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>>> check_output(["ls", "-l", "/dev/null"])
b'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
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>>> check_output(["/bin/sh", "-c",
... "ls -l non_existent_file ; exit 0"],
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b'ls: non_existent_file: No such file or directory\n'
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>>> subprocess.getstatusoutput('cat /bin/junk')
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executable: A replacement program to execute.
stdin, stdout and stderr: These specify the executed programs' standard
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preexec_fn: (POSIX only) An object to be called in the child process
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close_fds: Controls closing or inheriting of file descriptors.
shell: If true, the command will be executed through the shell.
cwd: Sets the current directory before the child is executed.
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universal_newlines: If true, use universal line endings for file
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startupinfo and creationflags (Windows only)
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pass_fds (POSIX only)
Attributes:
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zPopen._save_inputc C s& | j d k r" t j | j | � d S)z Send a signal to the process.N)r r� rd r� )r r� r r r r� � s c C s | j t j � d S)z/Terminate the process with SIGTERM
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