本文实例讲述了python类和对象的定义与实际应用。分享给大家供大家参考，具体如下：
1.dvd管理系统
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# -*- coding:utf-8 -*-#! python3class dvd: def __init__(self,name,price,state): self.name=name; self.price=price self.state=state def __str__(self): stat='已借出'; if self.state==1: stat='未借出' return '名称：《%s》 单价:%d 状态:%s'%(self.name,self.price,stat)class dvdmanager: #存储 多个dvds 每一个元素 都是一个dvd dvds=[] def init(self): self.dvds.append(dvd('光辉岁月',10,0)); self.dvds.append(dvd('绅士', 5, 1)); self.dvds.append(dvd('海阔天空', 11, 1)); def menu(self): self.init() while(true): print('1.查询所有dvd') print('2.增加dvd') print('3.借出dvd') print('4.归还dvd') print('5.退出') choose=int(input('请选择：')); if choose==1: self.showalldvd(); elif choose==2: self.insertdvd(); elif choose==3: self.jiechudvd(); elif choose==4: self.rollbackdvd(); elif choose==5: print('5.谢谢使用') break; def showalldvd(self): for d in self.dvds: print(str(d)) def jiechudvd(self): name = input('请输入dvd的名称：') ret = self.checkdvd(name); if ret != none: if ret.state==0: print('dvd 已经借出去了') #return; else: days=int(input('请输入借出天数：')) ret.state = 0; print('借出 %d 天，应还利息%d '%(days,ret.price*days)) else: print('dvd 不存在！') def rollbackdvd(self): name = input('请输入归还dvd的名称：') ret = self.checkdvd(name); if ret == none: print('dvd 不存在！') else: if ret.state == 1: print('dvd 未借出！') else: days= int(input('请输入借出去了多少天？')) y_money=ret.price * days print('借出 %d 天，应还利息%d ' % (days, y_money)) money=0; while true: money= int(input('请输入金额:')) #带学生完成.. if money<y_money: print('不够！') else: break; if money>=y_money: print('找零：%d'%(money-y_money)); ret.state=1; print('归还成功！') def insertdvd(self): name = input('请输入dvd的名称：') ret= self.checkdvd(name); if ret != none: print('dvd 已经存在！') else: price=int(input('请输入价格：')) new_dvd=dvd(name,price,1); self.dvds.append(new_dvd) print('存放成功！') def checkdvd(self,name): for d in self.dvds: if d.name==name: return d;#返回当前对象-->内存地址 else: return none;manager= dvdmanager();manager.menu(); |
本机测试运行结果：
2.给宠物看病
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# -*- coding:utf-8 -*-#! python3class pet: def kanbing(self): print('给宠物看病。。')class car(pet): def kanbing(self): print('给猫咪看病 吃药，吃小黄鱼..')class dog(pet): def kanbing(self): print('给狗狗看病 输液 吃骨头....')class bird(pet): def kanbing(self): print('看小鸟看病 拔罐 吃虫子... ')class pig(pet): def kanbing(self): print('给小猪看病 针灸 吃猪粮... ')class shouvet: def jiuzhen(self,pet): print('兽医出诊..给宠物看病...') pet.kanbing();class person: def kanbing(self): print('给人类看病 望闻问切 多喝水..')dingdang=car();kala=dog();huangli=bird();peiqi=pig()bianque=person()syi=shouvet();syi.jiuzhen(dingdang);syi.jiuzhen(kala);syi.jiuzhen(huangli);syi.jiuzhen(peiqi);syi.jiuzhen(bianque) |
本机测试运行结果：
3.计算机
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# -*- coding:utf-8 -*-#! python3class operation(object): ''' 四则运算的父类,接收用户输入的数值 ''' def __init__(self, number1=0, number2=0): self.num1 = number1 self.num2 = number2 def getresult(self): pass pass#加法运算类class operationadd(operation): def getresult(self): return self.num1 + self.num2#减法运算类class operationsub(operation): def getresult(self): return self.num1 - self.num2#乘法运算类class operationmul(operation): def getresult(self): return self.num1 * self.num2#除法运算类class operationdiv(operation): def getresult(self): if self.num2 == 0: return '除数不能为0 ' return 1.0*self.num1 / self.num2#其他操作符类class operationundef(operation): def getresult(self): return '操作符错误'#简单工厂类class operationfactory(object): def choose_oper(self,ch): if ch == '+': return operationadd() elif ch == '-': return operationsub() elif ch == '*': return operationmul() elif ch == '/': return operationdiv() else: return operationundef()if __name__ == "__main__": ch = '' while not ch == 'q': num1 = input('请输入第一个数值: ') oper = str(input('请输入一个四则运算符: ')) num2 = input('请输入第二个数值: ') # operation(num1,num2) of = operationfactory() oper_obj = of.choose_oper(oper) oper_obj.num1 = num1 oper_obj.num2 = num2 print('运算结果为: ',oper_obj.getresult()) |
希望本文所述对大家python程序设计有所帮助。
原文链接：https://blog.csdn.net/mid_python/article/details/79232225
