Python初学者之路--遍历字典

'''遍历字典'''

fav_lag={
        'aerfa':'C',
        'Betha':'python',
        'Kevin':'JAVA',
        'olIver':'Lingo'}

for name, lag in fav_lag.items():   # items() 返回的是键值对，但是顺序与存储顺序无关
    print('\n',name,"'s favourite language is",lag)

print('\n\n')

for name , lag in sorted(fav_lag.items(),reverse=True):  #按照的键字母的 ASCII 从小到大(默认)
    print('\n',name.title(),"'s favourite language is",lag.upper())
    
    '''遍历字典内的键'''
for name in fav_lag.keys():       #keys() 返回键 同样顺序规律同items()
    print('\n',name.upper())

for lag in fav_lag.values():      #values() 返回值 顺序同上
    print('\n',lag.lower())
    
names1=['phil','Betha','aaa','olIver']

for name in names1:
    if name in fav_lag.keys():          #name 可以当做变量引用出对应的 值
        print('\n',name,'You are in the list','and your favourite language is',fav_lag[name])
    
fav_lag['Neil wen']='python'
'''for lag in fav_lag.values():
    print('\n',lag)                  #不忽略重复项'''

for lag in set(fav_lag.values()):   #set() 相当于集合，即各元素之间不能相同
    print('\n',lag)                 #在set()外加 sorted()依然可行