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os.system()provides less control than thesubprocess.Popeninterface -- most importantly, it provides no way to pass data out-of-band from code (or to provide a literal argv array), making it hard to avoid shell injection vulnerabilities.shell=Trueis the wrong thing for yoursubprocess.call(["echo", i], shell=True)example: The shell script that's run is justecho, with no arguments, and theiis passed as an argument to the shell that the script doesn't refer to.