Overloading assignment operator

Erik Max Francis max at alcyone.com
Tue Jan 23 21:02:40 CET 2007


Achim Domma wrote:

> I want to use Python to script some formulas in my application. The user 
> should be able to write something like
> 
> A = B * C
> 
> where A,B,C are instances of some wrapper classes. Overloading * is no 
> problem but I cannot overload the assignment of A. I understand that 
> this is due to the nature of Python, but is there a trick to work around 
> this?
> All I'm interested in is a clean syntax to script my app. Any ideas are 
> very welcome.

Are you sure you even need to do that?

 >>> class C:
...  def __init__(self, x):
...   self.x = x
...  def __mul__(self, other):
...   return C(self.x*other.x)
...
 >>> result = C(2)*C(3)
 >>> print result
<__main__.C instance at 0x402e13ec>
 >>> result.x
6

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 20 N 121 53 W && AIM, Y!M erikmaxfrancis
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    -- Fran Lebowitz



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