comp/work/54/rpn.py


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def eval(expr):
    s = []
    for i in expr.split():
        if i.isdigit():
            s.push(int(i))
        else:
            a = s.pop()
            b = s.pop()
            match i:
                case '+':
                    s.push(b + a)
                case '-':
                    s.push(b - a)
                case '*':
                    s.push(b * a)
                case '/':
                    s.push(b / a)

    print(s.pop())

eval("1 2 +")