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When an expression has multiple free variables (e.g. "x^2 + y^2"), the user is prompted to input values twice, but the prompt is labelled with the name of the last variable every time

Expression: Log((z^3 + 2*x^2 + 3)/((z - 1)^2))
x := 10
x := 12
Result: Log(((((z ^ 3) + (2 * (x ^ 2))) + 3) / ((z - 1) ^ 2))) = 2.768723236174204

2.768723236174204 is the correct value for z = 10 and x = 12, so its only the symbol which is showing up wrong.

This is due to the scope of the lambda: int(input(string)) being bound to the parsing loop, so the value of string comes from there.