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How to use a string in a symbolic expression with SageMath?

I would like to use a string as part of a symbolic expression. For instance:

function('P') var('x1 x2 x3 y1 y2 y3')
st = eval('y1,0,1')

How could I use st which is a string in the symbolic expression sum?

I want the same result as if I had typed directly: