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Main API
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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
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call(...): Runs a command, waits for it to complete, then returns
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check_output(...): Same as check_call() but returns the contents of
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