[sock] = netutil.bind_sockets(None,'localhost',family=socket.AF_INET)
我理解这些作业：list [index] = val,list [index1：index2] = list2,但我从未见过Tornado.
这是一个更简单的语法示例：
>>> def foo(): ... return ['potato'] ... >>> [p] = foo() >>> p 'potato'
