<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def mod(self):
 """ Cached compiled binary of the Generic_Code class. To clear cache invoke :meth:`clear_mod_cache`. """

        if self._mod is None:
            self._mod = self.compile_and_import_binary()
        return self._mod