<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def close(self, file_des):
 """Close a file descriptor. Args: file_des: An integer file descriptor for the file object requested. Raises: OSError: bad file descriptor. TypeError: if file descriptor is not an integer. """

        file_handle = self.filesystem.get_open_file(file_des)
        file_handle.close()