python学习之第八篇——字典嵌套之字典中嵌套字典

 cities = {
     'shanghai':{'country':'china','population':10000,'fact':'good'},
     'lendon':{'country':'england','population':2348,'fact':'nice'},
     'new york':{'country':'american','population':8650,'fact':'rich'},
     }
 for city,characts in cities.items():
     print("city:"+city.title())
     print("\tcountry:"+characts['country'])
     print("\tpopulation:"+str(characts['population']))
     print("\tfact:"+characts['fact'])
     print("\n")

1 再次重申：for 后面可以跟两个变量来访问键和值，这一功能由.items()完成

2 仔细思考for 后面的两个变量的含义。并根据此深入思考访问的机制