python遍历字典键值对的问题

Question

使用for循环打印出字典包含的国家，结果只打印了3个国家，为啥，怎么打全？

top3river ={
    'nile':'Tanzania',
    'nile':'Burundi',
    'nile':'Rwanda',
    'nile':'Uganda',
    'nile':'Sultan',
    'nile':'Egypte',
    'Amazon River':'Peru',
    'Amazon River':'Brazil',
    'Yangtze River':'China'
    }
for river,country in top3river.items():
    print('The ' + river.title() + ' runs through '
          + country.title() + '.')
for name in top3river.keys():
    print("The river's name is " + name +'.')
for country in top3river.values():
    print(country)

Answer 1

python字典中的key具有唯一性，你的数据字典中只有三个key值，所以后面的{key，value}会覆盖前面的值，所以字典中只有三个国家的