Bonus: simple python socket client

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First, accessing the command line from Python. There are a lot of old ways to do this (, Popen) but these are deprecated in favor of the subprocess module. pipe_command() wraps subprocess and manages standard I/O. The first line makes sure there is input before attaching the input pipe. The second line launches the command supplied by arg_list. The remaining lines pipe the input (if any) and return the output through .communicate().

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