from pythonds.basic.stack import Stack

def postfixEval(postfixExpr): operandStack = Stack() tokenList = postfixExpr.split()

for token in tokenList: if token in "0123456789": operandStack.push(int(token)) else: operand2 = operandStack.pop() operand1 = operandStack.pop() result = doMath(token,operand1,operand2) operandStack.push(result) return operandStack.pop()

def doMath(op, op1, op2): if op == "*": return op1 * op2 elif op == "/": return op1 / op2 elif op == "+": return op1 + op2 else: return op1 - op2

print(postfixEval('7 8 + 3 2 + /'))

Modify the postfix evaluation algorithm so that it now handles exponentiation and modulo operations..