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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_file(self, fp, headers=None, cb=None, num_cb=10, torrent=False):
 """ Retrieves a file from a Key :type fp: file :param fp: File pointer to put the data into :type headers: string :param: ignored in this subclass. :type cb: function :param cb: ignored in this subclass. :type cb: int :param num_cb: ignored in this subclass. """

        if self.key_type & self.KEY_STREAM_READABLE:
            raise BotoClientError('Stream is not Readable')
        elif self.key_type & self.KEY_STREAM_WRITABLE:
            key_file = self.fp
        else:
            key_file = open(self.full_path, 'rb')
        try:
            shutil.copyfileobj(key_file, fp)
        finally:
            key_file.close()