<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_line(self):
 """Get a line or raise StopIteration"""

        line = self._f.readline()
        if len(line) == 0:
            raise StopIteration
        return line