def install(self):
    ' Install the tracer function, required for the watchdog '
    if (not self.installed):
        sys.settrace(self.tracer)
        self.installed = True
Install the tracer function, required for the watchdog
def install(self):
    '  '
    if (not self.installed):
        sys.settrace(self.tracer)
        self.installed = True