mathmatical expressions evaluation

[Tonino]

Hi,

I have a task of evaluating a complex series (sorta) of mathematical
expressions and getting an answer ...

I have looked at the numarray (not really suited??) and pythonica (too
simple??) and even tried using eval() ... but wondered if there were
other packages/modules that would enable me to to this a bit easier...

The formula/equations are for investment calculations (Swap Yields).
Is there a module/method that anyone can suggest ??

Many thanks
Tonino