Re: [Jython-users] Supporting + on Java objects

[Kevin B. <kb...@ca...>]

I'd be hesitant to do this.

A couple of reasons:

- In general, the Python string formatting idioms are preferred:
Instead of:
	print "text " + obj + ", " + obj2 + "/" + obj3
use:
	print "text %s, %s/%s" % (obj, obj2, obj3)
or:
	print "text %(obj)s, %(obj2)s/%(obj3)s" % vars()

- The proposed enhancement for Java instances would cause Python instances & java instances to behave differently:
	t = 5
	s = Object()
	print "text" + t + " " + s ## error

kb

Anthony Eden wrote:
> Currently, in Jython, using any arbitrary Java object aside from a java.lang.String, the following fails:
> 
>   print "text" + obj
> 
> With the message: TypeError: __add__ nor __radd__ defined for these operands
> 
> But the following works:
> 
>   print "test", obj
> 
> 
> Would the Jython implementers consider modifying the PyJavaInstance class with something similar to:
> 
>     public PyObject __add__(PyObject object) {
>     	return __str__ + object.__str__();
>     }
> 
> So that the + notation as used in Java works properly?  I am not sure if the code I provided above is correct as I am
> not intimately familiar with the Jython source.  I am also not sure if this has been discussed before: the mailing list
> archives provided at the Jython.org site do not have search facilities (AFAICT) and I was unable to find anything about
> it in my mail application (back to 7/21/2001), so I apologize ahead of time if it has.
> 
> Sincerely,
> Anthony Eden
> 
> 
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