python信息笔记——字典遍历

print('遍历所有键-值对')
user_0={
        'username':'efermi',
        'first':'enrico',
        'last':'fermi'
        }

for key,value in user_0.items():
    print("\nKey:"+key)
    print("value:"+value)
    
favorite_language={
        'jen':'python',
        'sarah':'C',
        'edward':'ruby',
        'phil':'python'
        }

for name,language in favorite_language.items():
    print(name.title()+"'s favorite language is"+language.title()+".")

print('遍历所有键')
for name in favorite_language:
#因为默认遍历所有键，这里进行简写，全部为for name in favorite_language.key()
#但全写会让代码更容易读
    print(name.title())
    
friends=['phil','sarah']
for name in favorite_language.keys():
    print(name.title())
    
    if name in friends:
        print("Hi"+name.title()+",I see your favorite language is"+
             favorite_language[name].title()+"!")

print("用sorted()顺序遍历")
for name in sorted(favorite_language.keys()):
      print(name.title()+",thank you for taking the poll.") 
 
print('遍历值')    
for language in favorite_language.values():
    print(language.title())
    
#涉及值很多时，最终列表含有大量重复项，用set剔除重复项
for language in set(favorite_language.values()):
    print(language.title())