Reverse Polish Notation (Python)

reverse_polish_notation.py

def evalRPN(self, tokens):
    
    stack = []
    
    for token in tokens:
        
        if token not in "+-/*":
            stack.append(int(token))
            continue
    
        number_2 = stack.pop()
        number_1 = stack.pop()
        
        result = 0
        if token == "+":
            result = number_1 + number_2
        elif token == "-":
            result = number_1 - number_2
        elif token == "*":
            result = number_1 * number_2
        else:
            result = int(number_1 / number_2)
            
        stack.append(result)

    return stack.pop()