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You can also use sympify:

sage: sage: x = var('x')
sage: sage: y = 2 * x + Ei(x)
sage: import sympy
sage: sympy.sympify(y)
2*x + Ei(x)
sage: type(_)
<class 'sympy.core.add.Add'>

You can also use sympify:

sage: sage: x = var('x')
sage: sage: y = 2 * x + Ei(x)
sage: import sympy
sage: sympy.sympify(y)
2*x + Ei(x)
sage: type(_)
<class 'sympy.core.add.Add'>