《python编程，从入门到实践》第六章

alien_0={'color':'green','points':'five'}
print(alien_0['color'])
alien_0['x_position']=3
alien_0['y_position']=3
print(alien_0)

#修改
alien_0['color']='yellow'
print(alien_0['color'])

#删除
del alien_0['x_position']
del alien_0['y_position']

#遍历
for key,value in alien_0.items():
    print("nkey: "+key)
    print("value: "+value)
    
for attribute in alien_0.keys():
    print(attribute)
#按顺序遍历
for name in sorted(alien_0.keys()):
    print()
#提取去重set
for name in sorted(set(alien_0.values())):
    print()
    
#字典中存字典
users = {
'aeinstein': {
'first': 'albert',
'last': 'einstein',
'location': 'princeton',
},
'mcurie': {
'first': 'marie',
'last': 'curie',
'location': 'paris',
},
}
for username, user_info in users.items(): 
    print("nUsername: " + username) 
    full_name = user_info['first'] + " " + user_info['last']
location = user_info['location']
print("tFull name: " + full_name.title())
print("tLocation: " + location.title())