name={
    'ljy':'25',
    'qx':'23'
}
print(name['ljy'])

name={
    'ljy':'25',
    'qx':'23'
}
name['wewe']=55  #添加一个字典
print(name)
del name['ljy'] #删除一个字典
print(name)
name['qx']=44 #修改一个字典
print(name)

name={
    "qxc":'21',
    'ljy':'22',
    'wer':'34'
}
for user,age in name.items(): #items()函数返回一对键值队列表
    print("user: " + user+"," +"age: " + age)