Twisted uses the following code (on UNIX-like OS):

def launchWithName(name):
    if name and name != sys.argv[0]:
        exe = os.path.realpath(sys.executable)
        log.msg('Changing process name to ' + name)
        os.execv(exe, [name, sys.argv[0], '--originalname'] + sys.argv[1:])

Twisted doesn't care if sys.executable is invalid when argv[0] has been changed. sys.executable is only used to change the process name (sys.executable is used before argv[0] is modified).