<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_fouts(self):
 """Get output filename."""

        fouts_txt = []
        if 'o' in self.kws:
            fouts_txt.append(self.kws['o'])
        if 'f' in self.kws:
            fouts_txt.append(self._get_fout_go())
        return fouts_txt