exception subprocess.CalledProcessError 
Subclass of SubprocessError, raised when a process run by check_call() or check_output() returns a non-zero exit status.
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returncode
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Exit status of the child process. If the process exited due to a signal, this will be the negative signal number. 
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cmd
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Command that was used to spawn the child process. 
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output
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Output of the child process if it was captured by run()orcheck_output(). Otherwise,None.
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stdout
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Alias for output, for symmetry with stderr.
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stderr
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Stderr output of the child process if it was captured by run(). Otherwise,None.
Changed in version 3.5: stdout and stderr attributes added
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