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### How to use associated legendre polynomials in sage?

Hey, I'm trying to make a symbolic expression (function) that depends on associated lengendre polynomials. For this I'm using the maxima module/interface. When I do something like

maxima.assoc_legendre_p(2,0,x)


I get the correct output. But when I try something like the following

lp(l,m,x) = maxima.assoc_legendre_p(l,m,x)


and then lp(2,0,3) all I get is "assoc_legendre_p(2, 0, 3)". So it's not understanding the "assoc_legendre_p" part, it takes it as many symbols. How could I achieve this? Thanks.

PS: The actual expression is more complicated than that, but to makes thing simple I used a basic example.