Python-RPN/rpn.py at main · Chudson16/Python-RPN · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

stack = []

def add():
    b = stack.pop()
    a = stack.pop()
    stack.append(a + b)

def subtract():
    b = stack.pop()
    a = stack.pop()
    stack.append(a - b)

def multiply():
    b = stack.pop()
    a = stack.pop()
    stack.append(a * b)

def divide():
    b = stack.pop()
    a = stack.pop()
    stack.append(a / b)

operations = {
    "+" : add,
    "-" : subtract,
    "*" : multiply,
    "/" : divide
}

while True:
    inpt = input()

    try:
        inpt = float(inpt)
        stack.append(inpt)
    except:
        try:
            inpt = operations[inpt]()
            print(stack[-1])
        except:
            raise ValueError

    print(stack)