[已解决]求助为什么会报错

惟余莽莽

river = { 'nile':'eygot','huang river':'china','mississippi river':'america'}
for key,value in river.items():
    print(f"The {key.title()} runs through {value.title()} ")
for river in sorted(river.keys()):
    print(river)
for nation in sorted(river.values()):
    print(nation)


为什么会报错呢？
下面两个for循环去掉一个就不报错了，又是为什么呢？

最佳答案

月排行榜 / 总排行榜

傻眼貓咪

2021-10-11 12:32:58

1. river = { 'nile':'eygot','huang river':'china','mississippi river':'america'}
   
2. for key,value in river.items():
   
3.     print(f"The {key.title()} runs through {value.title()} ")
   
4. for river in sorted(river.keys()): # 这里你用和字典同名（river）已经改变 river 值了，river 不再是字典了
   
5.     print(river)
   
6. for nation in sorted(river.values()):
   
7.     print(nation)

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傻眼貓咪

1. river = { 'nile':'eygot','huang river':'china','mississippi river':'america'}
   
2. for key,value in river.items():
   
3.     print(f"The {key.title()} runs through {value.title()} ")
   
4. for river in sorted(river.keys()): # 这里你用和字典同名（river）已经改变 river 值了，river 不再是字典了
   
5.     print(river)
   
6. for nation in sorted(river.values()):
   
7.     print(nation)

复制代码

惟余莽莽

傻眼貓咪 发表于 2021-10-11 12:32

豁然开朗，少打了一个s，谢谢