python面向对象编写案例
Python面向对象程序设计示例小结本文实例讲述了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:
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#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:
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#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:
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'''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:
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'''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:
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'''#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。
原文链接:https://blog.csdn.net/fengshenyue/article/details/54692623