Implement in Python using stack operations Postfix Calculator Post fix calculator . We use a stack When an operand is read, push it on statck When an operator is readi.e +, *. ), - - Pop two from the top of the stack and apply the operator and push the result on stack if there is one value instead of two display an error message Keep repeating until an equal sign, = is read; pop from the top of stack and stop. Postfix Expression Result 4572 +-* = -16 ===> (5 -(7+2))* 4 = -16 34+2 * 7/ = 2 57 +62- * = 48 42351-+*+ = 18 ===> (5-1 +3)* 2+4 = 18 You find the Python solution under chapter nine module by the name of "List as Stack"