练习 DVD 读取初始 xm l数据

创建一个xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<dvds>
    <dvd>
        <name>悠然的故事</name>
        <price>200</price>
        <state>1</state>
    </dvd>
    <dvd>
        <name>春天的风</name>
        <price>300</price>
        <state>0</state>
    </dvd>
    <dvd>
        <name>冬天的阳光</name>
        <price>400</price>
        <state>1</state>
    </dvd>
</dvds>

==============================================

引路径：

import xml.etree.ElementTree as ET

# 1先加载文档发哦内存里 形成一个倒桩的树结构

from python高级内容.DVD管理系统 import DVD

tree = ET.parse('dvd.xml')

# 2.获取根节点

root = tree.getroot()

dvds=[]

def getdvds():

    for dvd in root:

        n_dvd = DVD()

        for ele in dvd:

            if ele.tag=='name':

                n_dvd.name=ele.text

            elif ele.tag=='price':

                n_dvd.price=ele.text

            elif ele.tag=='state':

                n_dvd.state=ele.text

            dvds[n_dvd.name]=n_dvd

    return dvds

==============================================

DVD 系统：

from python高级内容 import 练习DVD读取初始xml数据2 as dr

class DVD:

    def __init__(self,*args):

        self.name = ''

        self.price = ''

        self.state = ''

  #第一种：      # if len(args)>0:

        #     self.name=[0]

        #     self.price=[1]

        #     self.state=[2]

if __name__=='__main__':

    # youran=DVD('悠然的故事',200,1)#0：借出 1未借出

    # chuntian=DVD('春天的风',200,0)#0：借出 1未借出

    # dongtian=DVD('冬天的阳光',200,1)#0：借出 1未借出

    # dvds = {youran.name:youran,chuntian.name:chuntian,dongtian.name:dongtian}

    dvds= dr.getdvds()

    while True:

        print('----DVD管理系统-----')

        print('1.查询说有DVD')

        print('2.增加DVD')

        print('3.借出DVD')

        print('4.归还DVD')

        print('5.退出')

        num=int(input('请选择：'))

        if num == 5:

            break

        elif num == 1:

            print('名字\t价格\t状态')

            for key in dvds.keys():

                if dvds.get(key).state__eq__0:

                    print(key+'\t'+str(dvds.get(key).price)+'\t借出')

                else:

                    print(key+'\t'+str(dvds.get(key).price)+'\t未借出')

        elif num == 2:

            name=input('请输入DVD的名字：')

            while name in dvds.keys():

                name = input('DVD的名字已存在，请重新输入：')

            price = input('请输入DVD的价格')

            # if name

            new_dvd =DVD(name,price,1)

            dvds[name] = new_dvd

            print('添加成功')

        elif num == 3:

            name = input('请输入要借出的DVD的名字：')

            while name not in dvds.keys():

                name = input('DVD不存在，请重新输入：')

            if dvds.get(name).state==0:

                print(name+'已借出')

            else:

                dvds.get(name).state = 0

                print(name+'借出成功')

        elif num == 4:

            name = input('请输入要归还的DVD名字：')

            while name not in dvds.keys():

                name = input('DVD不存在，请重新输入：')

            if dvds.get(name).state == 1:

                print('DVD 未借出')

            else:

                days = int(input('请输入借出的天数：'))

                print('请刷卡：',int(dvds.get(name).price)*days,'.00元')

                dvds.get(name).state = 0

                print('归还成功！')