Question: Implement a program that can input an expression in postfix notation (see following explanation) and output its value, using stack from the class ArrayStack in

Implement a program that can input an expression in postfix notation

Implement a program that can input an expression in postfix notation (see following explanation) and output its value, using stack from the class ArrayStack in file array stack.py. Postfix notation is an unambiguous way of writing an arithmetic expression without parentheses. It is defined so that if (exp)op(exp2) is a normal, fully parenthesized expression whose operation is op, the postfix version of this is pexp pexp, op, where pexp, is the postfix version of exp, and pexp, is the postfix version of exp2. The postfix version of a single number or variable is just that number or variable. For example, the postfix version of ((5+2)*(8-3))/4 is 5 2 + 8 3 * 4/

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