studentinfo = {
'Jack':{'age':14,'address':'street waltz,no2'},
'Tom':{'age':14,'address':'street waltz,no2'},
}
print(studentinfo['Jack']['age'])#14 key-value中的【key-value】
studentinfo = {
'Jack':{'age':14,'address':'street waltz,no2'},
'Tom':{'age':14,'address':'street waltz,no2'},
}
print(studentinfo['Jack']['age'])#14 key-value中的【key-value】