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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self, postfunc=lambda: None):
 """Run the jobs. postfunc() will be invoked after the jobs has run. It will be invoked even if the jobs are interrupted by a keyboard interrupt (well, in fact by a signal such as either SIGINT, SIGTERM or SIGHUP). The execution of postfunc() is protected against keyboard interrupts and is guaranteed to run to completion."""

        self._setup_sig_handler()
        try:
            self.job.start()
        finally:
            postfunc()
            self._reset_sig_handler()