<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def working_directory(self):
 """ Get the current working directory. :rtype: str :return: current working directory """

        _complain_ifclosed(self.closed)
        wd = self.fs.get_working_directory()
        return wd