subexpressions

[Tijs]

Steve Howell wrote:
> FWIW there's the possibility that even without a
> subexpression syntax, some Python implementations
> would detect the duplication of x*x and optimize that
> for you.  It would have to know that x*x had no side
> effects, which I think is a safe assumption even in a
> dynamic language like Python.

No, x may be an object that has the __mul__ special method, and it may have
side effects. 

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Regards,
Tijs