On Oct 7, 10:39 pm, Francois Maltey <fmal...@nerim.fr> wrote:
> Hello,
>
> I play with expressions, and transform sin(x) to (exp(i*x)-exp(-i*x))/2.
>
> So I use a lot of test as
>
> var ('x')
> y = cos(x) # or any other expression"
> op = y.operator # so op == cos
> if op == cos : ... # this test is fine, not the next one
> else : ...
>
> Now I want to test an expression with the binomial function call.
>
> y = binomial (3*x, x) # is fine
> op = y.operator() # is also fine
Why is there a () here, but not in the previous example?
Dag
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