Python Shelve 无法检索对象

Question

我尝试存储对象并能够成功。但是我有问题，同时收回它..错误如下

person.py

class Person:
    def __init__(self, name, age, pay=0, job=None):
        self.name = name
        self.age  = age
        self.pay  = pay
        self.job  = job
    def lastname(self):
        return  self.name.split()[-1]
    def giveraise(self,percent):
        #return self.pay *= (1.0 + percent)
        self.pay *= (1.0 + percent)
        return self.pay

Manager.py

from Person import Person
class Manager(Person):
    def giveRaise(self, percent, bonus=0.1):
        self.pay *= (1.0 + percent + bonus)        
        return self.pay

update_db_classes.py

import shelve
from Person import Person
from Manager import Manager
bob = Person('Bob Smith', 42, 30000, 'software')
sue = Person('Sue Jones', 45, 40000, 'hardware')
tom = Manager('Tom Doe',  50, 50000)
db = shelve.open('class-shelve')
db['bob'] = bob
db['sue'] = sue
db['tom'] = tom
db.close()

用于检索对象的代码。dump_db_classes.py

import shelve
db = shelve.open('class-shelve')
for key in db:
    print(key, '=>n  ', db[key].name, db[key].pay)
bob = db['bob']
print(bob.lastName())
print(db['tom'].lastName())

错误：C：\Python27\Basics>dump_db_classes.py鲍勃 => 鲍勃·史密斯 30000苏 => 苏·琼斯 40000汤姆=> 汤姆·多伊 50000回溯（最近一次调用）： 文件 "C：\Python27\Basics\dump_db_classes.py"，第 8 行，在 print（bob.lastName（））属性错误："人员"对象没有属性"lastName"

Answer 1

Python 区分大小写。 您调用bob.lastName()但Person方法是.lastname() 。 错误消息试图告诉您：

AttributeError: 'Person' object has no attribute 'lastName'