from?collections?import?*
if?__name__?==?'__main__':
????print("hello?world")
????dict1={"hello":1,"world":2}
????dict2={"hello":3,"java":3}
????dict4={"hello":5,"java":5}
????dict3=ChainMap(dict1,dict2)
????print(dict3)
????#?maps:把ChainMap對(duì)象轉(zhuǎn)化為list對(duì)象，可以被訪問(wèn)和修改。
????print(dict3.maps)
????#?new_child:在字典前插入一個(gè)新的字典，參數(shù)為空：插入一個(gè)空的字典。參數(shù)不為空，插入第一個(gè)位置。
????#ChainMap({},?{'world':?2,?'hello':?1},?{'java':?3,?'hello':?3})
????print(dict3.new_child())
????#ChainMap({'java':?5,?'hello':?5},?{'world':?2,?'hello':?1},?{'java':?3,?'hello':?3})
????print(dict3.new_child(dict4))