包与模块管理

模块

from

from 引入整个模块
from…import…as…

import

improt 可以引入其他模块的信息

包

importlib不能用from的方式重新载入，只能是模块的方式

面向对象编程

封装

字典表

类

class

import datetime
class Book:
    def __init__(self,title,price,author,publisher,pubddate):
        self.title = title
        self.price = price
        self.author = author
        self.publisher = publisher
        self.pubddate = pubddate
book1 = Book("财管",39,"sara","class1",datetime.date(2016,3,1))


print(book1.title)
print(book1.pubddate)

结果是：
财管
2016-03-01

import datetime
class Book:
    def __init__(self,title,price,author,publisher,pubdate):
        self.title = title
        self.price = price
        self.author = author
        self.publisher = publisher
        self.pubdate = pubdate
    def __repr__(self):
        return"<图书{}at{}>".format(self.title,id(self))     #定义book返回的信息


    def print_info(self):
        print("当前这本书的信息如下:")
        print("标题:{}".format(self.title))
        print("定价{}".format(self.price))
        print("作者{}".format(self.author))
        print("出版社{}".format(self.publisher))
        print("出版时间{}".format(self.pubdate))

book1 = Book("财管",39,"sara","class1",datetime.date(2016,3,1))
book1.print_info()

print(book1.title)
print(book1.pubdate)

结果是：
当前这本书的信息如下:
标题:财管
定价39
作者sara
出版社class1
出版时间2016-03-01
财管
2016-03-01