Jython operator override question

Dear all,

Let's look at the sample code for operator override below:

# point.py 
# Operator override test 
class Point(): 
    def __init__(self, x=0, y=0): 
        self.x = x 
        self.y = y 

    def __str__(self): 
        return "({0},{1})".format(self.x, self.y) 

    def __add__(self, other): 
        if isinstance(other, Point): 
            x = self.x + other.x 
            y = self.y + other.y 
        else: 
            x = self.x + other 
            y = self.y + other 
        return Point(x, y) 

#Run test in module 
if __name__ == '__main__': 
    p1 = Point(2,3) 
    p2 = Point(-1,1) 
    p3 = p1 + p2 
    p4 = p1 + 2 
    p5 = 2 + p1 
    print 'p3 = ' + str(p3) 
    print 'p4 = ' + str(p4) 
    print 'p5 = ' + str(p5)


For this "+" operator override sample:
p4 = p1 + 2       is ok
but:
p5 = 2 + p1      will cause error: TypeError: unsupported operand type(s) for +: 'int' and 'instance'

So my question is how to make 'p5 = 2 + p1' run?

Thanks for any help!

Yaqiang


**************************************************
Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China

http://www.meteothinker.com
http://hi.baidu.com/meteoinfo
　　　　　　　　　　　　
[email protected]
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