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  1. import re
  2.  
  3. exp = None
  4. while True:
  5.     exp = input('Введите выражение или введите \'exit\'\n')
  6.     exp.replace(' ', '')
  7.     check_exp = re.findall(r'^\d+[\+\-\\\*]{1}\d+$', exp)
  8.     if check_exp:
  9.         print(eval(check_exp[0]))
  10.     elif exp == 'exit':
  11.         break
  12.     else:
  13.         print('Данные некоректны')
  14.         continue
  15.  
Runtime error #stdin #stdout #stderr 0.01s 28384KB
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stdin
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Standard input is empty
stdout
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Введите выражение или введите 'exit'
stderr
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Traceback (most recent call last):
  File "./prog.py", line 5, in <module>
EOFError: EOF when reading a line
https://ideone.com/UA2GUx
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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