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Python面向对象程序设计示例小结

更新时间:2020-06-23 10:24:01 作者:startmvc
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:#encodin

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。

Python 面向对象程序设计