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 -*-
#! python3
class 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();
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本机测试运行结果:
2.给宠物看病
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# -*- coding:utf-8 -*-
#! python3
class 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)
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本机测试运行结果:
3.计算机
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# -*- coding:utf-8 -*-
#! python3
class 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())
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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