Python面向对象程序设计示例小结

#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()

#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__

'''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)

'''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

'''#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