slelievre:
projetmbc:
>
> suppose that I have *sqrt(6)*(sqrt(3)+5)*. How can I count
>>
> the number of square root in this expression ?
>>
>
> sage: a = sqrt(6)*(sqrt(3)+5)
> sage: a
> sqrt(6)*(sqrt(3) + 5)
> sage: s = str(a)
> sage: s
> 'sqrt(6)*(sqrt(3) + 5)'
> sage: s.count('sqrt')
> 2
>
or you could explore the expression's tree
with a.operator(), a.operands(), etc., and
count the number of 'sqrt' operators.
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