Python面向对象程序设计 Python面向对象程序设计示例小结
lryong. 人气:0本文实例讲述了Python面向对象程序设计。分享给大家供大家参考,具体如下:
示例1:
#encoding:utf-8 '''example 1 class test: def __init__(self,year,**arg): self.year = year self.args = arg def kaka(self): if isinstance(self.year,str): print 'input\'s year is a string! Error' elif isinstance(self.year,int): a = self.year%4 print a else: print 'Error!' def deal_arg(self): # for v in self.args: # print '\n====================\n',v for k in self.args: print str(k)+'\tvalue is '+str(self.args[k]) print self.args a = test(2014,a=123,b=321) a.kaka() a.deal_arg()
运行结果:
2
a value is 123
b value is 321
{'a': 123, 'b': 321}
示例2:
#encoding:utf-8 '''example 2''' class test: '这是一个测试的基类' def __init__(self,test): self.test = test '这是一个测试的基类' print 'test.__doc__:',test.__doc__ print 'test.__name__:',test.__name__ print 'test.__module__:',test.__main__ print 'test.__bases__:',test.__bases__ print 'test.__dict__:',test.__dict__
示例3:
'''example 3 Class inheritance and method partial rewriting''' class parent: def __init__(self): print '这是一个父类' def ParentsMethond(self): print '这是一个父类方法' def Parenttest(self,arg): self.arg = 'This is a test!' print '父类的self变量: %s' %self.arg parent.arg = arg print '父类的变量: %s' %parent.arg class child(parent): """docstring for child""" def __init__(self): print '这是一个子类' def ChildMethod(self): print '调用子类方法 child method' def ParentsMethond(self): print '父类方法重写!!!!!!!!!!!!!!!!!!!!' b= parent() c = child() c.ChildMethod() print '*'*10 b.ParentsMethond() c.ParentsMethond() print '*'*10 c.Parenttest(3899)
运行结果:
这是一个父类
这是一个子类
调用子类方法 child method
**********
这是一个父类方法
父类方法重写!!!!!!!!!!!!!!!!!!!!
**********
父类的self变量: This is a test!
父类的变量: 3899
示例4:
'''example 4 Operator overloading''' class test: def __init__(self,a,b): self.a = a self.b = b def __str__(self): return 'Vector (%d,%d)' % (self.a,self.b) def __add__(self,other): return test(self.a+other.a,self.b+other.b) v1 = test(21,22) v2 = test(2,3) print v1 + v2
运行结果:
Vector (23,25)
示例5:
'''#example 5 private class''' class JustCounter(object): """docstring for JustCounter""" __secretCount = 0 #私有变量 publicCount = 0 #公开变量 def count(self): self.__secretCount +=1 self.publicCount +=1 print self.__secretCount counter = JustCounter() counter.count() counter.count() counter.count() counter.count() counter.count() print counter.publicCount print counter.__secretCount #报错,实例不能访问私有变量 print counter._JustCounter__secreCount
感兴趣的朋友可以测试上述代码运行效果。
希望本文所述对大家Python程序设计有所帮助。
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