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  1. #! /usr/bin/env python
  2. # -*- coding: utf-8 -*-
  3.  
  4. def main():
  5.     print('> ', end='')
  6.     cal = input().split()
  7.     stack = []
  8.     for c in cal:
  9.         if c.isdigit() == True:
  10.             stack.append(int(c))
  11.         elif len(stack) >= 2:
  12.             b = stack.pop()
  13.             a = stack.pop()
  14.             if c == '+':
  15.                 stack.append(a + b)
  16.             elif c == '-':
  17.                 stack.append(a - b)
  18.             elif c == '*':
  19.                 stack.append(a * b)
  20.             elif c == '/':
  21.                 if b == 0:
  22.                     print('division by zero')
  23.                     break
  24.                 stack.append(a / b)
  25.     if len(stack) == 1:
  26.         print(stack.pop())
  27.     else:
  28.         print('error')
  29.  
  30. if __name__ == '__main__':
  31.     main()
  32.  
Success #stdin #stdout 0.02s 28384KB
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https://ideone.com/2Xem3X
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
secret

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