@spin_first
    def clear(self, targets=None, block=None):
        """Clear the namespace in target(s)."""
        block = self.block if block is None else block
        targets = self._build_targets(targets)[0]
        for t in targets:
            self.session.send(self._control_socket, 'clear_request', content={}, ident=t)
        error = False
        if block:
            self._flush_ignored_control()
            for i in range(len(targets)):
                idents,msg = self.session.recv(self._control_socket,0)
                if self.debug:
                    pprint(msg)
                if msg['content']['status'] != 'ok':
                    error = self._unwrap_exception(msg['content'])
        else:
            self._ignored_control_replies += len(targets)
        if error:
            raise error
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/client/client.py/Client.clear/original