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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_output(["ls", "-l", "/dev/null"])
b'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
The stdout argument is not allowed as it is used internally.
To capture standard error in the result, use stderr=STDOUT.
>>> check_output(["/bin/sh", "-c",
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... stderr=STDOUT)
b'ls: non_existent_file: No such file or directory\n'
There is an additional optional argument, "input", allowing you to
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>>> check_output(["sed", "-e", "s/foo/bar/"],
... input=b"when in the course of fooman events\n")
b'when in the course of barman events\n'
By default, all communication is in bytes, and therefore any "input"
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If check is True and the exit code was non-zero, it raises a
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in the returncode attribute, and output & stderr attributes if those streams
were captured.
If timeout is given, and the process takes too long, a TimeoutExpired
exception will be raised.
There is an optional argument "input", allowing you to
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you may not also use the Popen constructor's "stdin" argument, as
it will be used internally.
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interpreted as a single argument, regardless of white space
contained within. A quoted string can be embedded in an
argument.
3) A double quotation mark preceded by a backslash is
interpreted as a literal double quotation mark.
4) Backslashes are interpreted literally, unless they
immediately precede a double quotation mark.
5) If backslashes immediately precede a double quotation mark,
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The exit status for the command can be interpreted
according to the rules for the function 'wait'. Example:
>>> import subprocess
>>> subprocess.getstatusoutput('ls /bin/ls')
(0, '/bin/ls')
>>> subprocess.getstatusoutput('cat /bin/junk')
(1, 'cat: /bin/junk: No such file or directory')
>>> subprocess.getstatusoutput('/bin/junk')
(127, 'sh: /bin/junk: not found')
>>> subprocess.getstatusoutput('/bin/kill $$')
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executable: A replacement program to execute.
stdin, stdout and stderr: These specify the executed programs' standard
input, standard output and standard error file handles, respectively.
preexec_fn: (POSIX only) An object to be called in the child process
just before the child is executed.
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.
env: Defines the environment variables for the new process.
text: If true, decode stdin, stdout and stderr using the given encoding
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universal_newlines: Alias of text, provided for backwards compatibility.
startupinfo and creationflags (Windows only)
restore_signals (POSIX only)
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encoding and errors: Text mode encoding and error handling to use for
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�r$ Y nX � Y nX W 5 d| _ X | j | �|�d�}||fS )a9 Interact with process: Send data to stdin and close it.
Read data from stdout and stderr, until end-of-file is
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child process, or None, if no data should be sent to the child.
communicate() returns a tuple (stdout, stderr).
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