Schur polynomials $s_\lambda$(or Schur functions) for a partition $\lambda$ is given by the bialternant formula of Jacobi, which is a ratio of two Vandermonde determinants: $$s_\lambda (x_1,x_2,\cdots,x_n)= \frac{a_{\lambda_1+n-1, \lambda_2+n-2, \cdots, \lambda_n +0)}(x_1,x_2,\cdots,x_n)}{a_{(n-1,n-2,\cdots,0)}(x_1,x_2,\cdots,x_n)}$$ where the Vandermonde determinant is given by $$a_{n-1,n-2,\cdots,0}(x_1,x_2,\cdots,x_n)=\prod_{1\leq j<k \leq n} (x_j-x_k)$$
This definition allows $\lambda$ to contain zeros. For exmaple, we have $$s_{(1,0)}=x_1+x_2.$$
This seems incompatible with the package SymmetricFunctions() in Sage. (https://doc.sagemath.org/html/en/reference/combinat/sage/combinat/sf/sfa.html) They seem to be unable to 'detect' zero. For example, $s[{1}]=s[{1,0}]$ in Sage, where $s[\lambda]$ is the Schur polynomial for partition $\lambda$.
I would like to use some commands in Sage, but I also need to work with partitions including zeros, like $(2,1,0)$. Is there a way to work this out in Sage, or is this the limitation coming from the difference of the definitions between, say, Wikipedia and Sage?