>>> T=threading.Thread(target=print,args=['dog','cat','frog'],kwargs={'sep':'&'})
>>> T.start()
dog
>>> &cat&frog


以上，是实际结果。俺想实现的效果如下：

>>> T=threading.Thread(target=print,args=['dog','cat','frog'],kwargs={'sep':'&'})
>>> T.start()
>>> dog&cat&frog