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  1. import operator as op, sys
  2.  
  3. table = {'+' : op.add, '-' : op.sub, '*' : op.mul, '/' : op.truediv}
  4.  
  5. def rpn(exp):
  6.     stack = []
  7.     for token in exp.split():
  8.         try: stack += [int(token)]
  9.         except ValueError:
  10.             try: stack += [float(token)]
  11.             except ValueError:
  12.                 stack = stack[:-2] + [table[token](*stack[-2:])]
  13.     return stack[-1]
  14.  
  15. if __name__ == "__main__":
  16.     while True:
  17.         exp = input("RPN > ")
  18.         if exp == "quit":
  19.             sys.exit()
  20.         else:
  21.             try:
  22.                 print("{:.4f}".format(rpn(exp)))
  23.             except:
  24.                 print("不正な入力です。")
  25.             finally:
  26.                 exp
  27.  
Runtime error #stdin #stdout #stderr 0.15s 23624KB
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stdin
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Standard input is empty
stdout
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RPN >
stderr
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Traceback (most recent call last):
  File "./prog.py", line 17, in <module>
EOFError: EOF when reading a line
https://ideone.com/0crTBo
language:
Python 3 (python  3.9.5)
created:
2 years ago
visibility:
public

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