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赵子jun

老师：我在用学习字典嵌套时，被要求用len函数，但是 出现语法错误，具体见截图，请老师指点！

1. if len(value for value in favorite_languages.values()) == 1:
   

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运行这行代码，显示语法错误。

赵子jun

1. favorite_languages = {
   
2.         'jen':['python','ruby'],
   
3.         'sarah':['c'],
   
4.         'edward':['ruby','go'],
   
5.         'phil':['python','haskell'],
   
6.        
   
7. if len(value for value in favorite_languages.values()) == 1:
   
8.         for name,languages in favorite_languages.items():
   
9.                 print('\n' + name.title() + " 's favorite language is: ")
   
10.                 for language in languages:
    
11.                         print('\t' + language.title())
    
12. if len(favorite_languages.values()) > 1:
    
13.         for name,languages in favorite_languages.items():
    
14.                 print('\n' + name.title() + " 's favorite language are: ")
    
15.                 for language in languages:
    
16.                         print('\t' + language.title())

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这是我完整的代码。