[已解决]关于items()获取字典的键值对的问题

pionrrt

想问一下，为什么这里会有报错

1. #create a mapping of state to abbreviation
   
2. state={"Oregon":"OR","Florida":"FL","California":"CA","New York":"NY","Michigan":"MI"}
   
3. #create a basic set of states and some cities in them
   
4. cities={"CA":"San Francisco","MI":"Detroit","FL":"Jacksonville"}
   
5. #add some more cities
   
6. cities["NY"]="New York"
   
7. cities["OR"]="Portland"
   
8. #print out some cities
   
9. print("-"*10)
   
10. print("NY State has:",cities["NY"])
    
11. print("OR State has:",cities["OR"])
    
12. 
    
13. #print some states
    
14. print("-"*10)
    
15. print("Michigan's abbreviation is:",state["Michigan"])
    
16. print("Florida's abbreviation is:",state["Florida"])
    
17. 
    
18. #print every state abbreviation
    
19. print("-"*10)
    
20. for state,abbrev in state.items():
    
21.     print("%s is abbreviated %s"%(state,abbrev))
    
22.    
    
23. #print every city in state
    
24. print("-"*10)
    
25. for abbrev,city in cities.items():
    
26.     print("%s has the city %s"%(abbrev,city))
    
27.    
    
28. #now do both at the same time
    
29. print("-"*10)
    
30. for state,abbrev in state.items():
    
31.     print("%s state is abbreviated %s and has city %s"%(state,abbrev,cities[abbrev]))
    
32. print("-"*10)
    
33. 
    
34. #safely get a abbreviation by state that might not be there
    
35. 
    
36. state=state.get("Texas",None)
    
37. 
    
38. if not state:
    
39.     print("Sorry, no Texas.")
    
40. #get a city with a default value
    
41. city=cities.get("TX","Does Not Exist")
    
42. print('''The city for the state "TX" is :%s'''%city)

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suchocolate

2023-6-14 13:12:09

for里的变量和state字典同名了。这样用：

1. 
   
2. states={"Oregon":"OR","Florida":"FL","California":"CA","New York":"NY","Michigan":"MI"}  # 变成复数
   
3. for state,abbrev in states.items():
   
4.     print("%s is abbreviated %s"%(state,abbrev))

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suchocolate

for里的变量和state字典同名了。这样用：

1. 
   
2. states={"Oregon":"OR","Florida":"FL","California":"CA","New York":"NY","Michigan":"MI"}  # 变成复数
   
3. for state,abbrev in states.items():
   
4.     print("%s is abbreviated %s"%(state,abbrev))

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