Calculadora pós fixa.py

def calcPosFix():
    expression=list(input('insira a expressao: '))
    
    while(len(expression)>1):
        if (len(expression)>3 and expression[2] == '*' and expression[3] == '*' ):
            value = str(eval(expression[0])**(eval(expression[1])))
            for i in range(4):
                del expression[0]
        
        else:
            value = str(eval(expression[0]+expression[2]+expression[1]))
            for i in range(3):
                del expression[0]

        expression.insert(0,value)
    print(expression)

calcPosFix()