The SageMath function sum accepts an optional "zero" argument precisely for this purpose
sage: sum([], 0) 0 sage: sum([], 11) 11 sage: sum([], []) [] Le 17/06/2019 à 11:18, Peter Luschny a écrit :
Hi, I think we should be confident that the sum of integers is again an integer, the sum of rational numbers a rational number and that the sum of polynomials is a polynomial. With Sage this is not the case. def ib(m, n): return sum(binomial(m*n-1, m*k)*OmegaPolynomial(m,k) for k in (0..n-1)) The terms "binomial(m*n-1, m*k)*OmegaPolynomial(m,k)" are of type <type 'sage.rings.polynomial.polynomial_integer_dense_flint.Polynomial_integer_dense_flint'> However "for n in (0..6): print(ib(2, n).list())" yields an AttributeError: 'int' object has no attribute 'list'. OK, it is not difficult to work around this. But would you agree to call this behavior a bug?
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