python入门（坐标相加）

代码：

  1 #coding=utf-8  2 class D2_point(object):  3         def __init__(self,x,y):  4                 print '***init'  5                 self.x = x  6                 self.y = y  7   8         def __add__(self,oth):  9                 print '***add' 10                 return D2_point(self.x + oth.x,self.y + oth.y) 11  12         def info(self): 13                 print '***info' 14                 print(self.x,self.y) 15  16 class D3_point(D2_point): 17         def __init__(self,x,y,z): 18                 print '3Dinit' 19                 super(D3_point,self).__init__(x,y)      #python2 中，super()需指定子类的继承 20                 self.z = z 21  22         def __add__(self,oth): 23                 print '3Dadd' 24                 return D3_point(self.x + oth.x,self.y + oth.y,self.z + oth.z) 25  26         def info(self): 27                 print '3Dinfo' 28                 print(self.x,self.y,self.z) 29  30 def myadd(a,b):         #注意此处是def，而不是class 31         print '***myadd' 32         return a + b 33  34 if __name__ == '__main__': 35         myadd(D2_point(1,2),D2_point(3,4)).info() 36         #myadd(D3_point(1,2,3),D3_point(4,5,6)).info()

执行1：

执行2：

代码：

  1 #coding=utf-8  2 class D2_point(object):  3         def __init__(self,x,y):  4                 print '***init'  5                 self.x = x  6                 self.y = y  7   8         def __add__(self,oth):  9                 print '***add' 10                 return D2_point(self.x + oth.x,self.y + oth.y) 11  12         def info(self): 13                 print '***info' 14                 print(self.x,self.y) 15  16 class D3_point(D2_point): 17         def __init__(self,x,y,z): 18                 print '3Dinit' 19                 #super(D3_point,self).__init__(x,y)     #python2 中，super()需指定子类的继承 20                 self.x = x 21                 self.y = y 22                 self.z = z 23  24         def __add__(self,oth): 25                 print '3Dadd' 26                 return D3_point(self.x + oth.x,self.y + oth.y,self.z + oth.z) 27  28         def info(self): 29                 print '3Dinfo' 30                 print(self.x,self.y,self.z) 31  32 def myadd(a,b):         #注意此处是def，而不是class 33         print '***myadd' 34         return a + b 35  36 if __name__ == '__main__': 37         #myadd(D2_point(1,2),D2_point(3,4)).info() 38         myadd(D3_point(1,2,3),D3_point(4,5,6)).info()

执行2+：