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Math expression syntax validator of parentheses in Python 3

/ Published in: Python
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Soma example of validation parentheses in math expressions.

[{()}] - valid
[{){}] - wrong

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  1. # Mathematical expression to validate
  2. code = "[(((a+b)*c+d-e)/(f+g)-(r+j)*(k+e))]";
  3.  
  4. parentheses_open = ['(', '{', '[']
  5. parentheses_close = [')', '}', ']']
  6.  
  7. def getParenthesesType(c):
  8.     if c in parentheses_open:
  9.         return parentheses_open.index(c)
  10.     elif c in parentheses_close:
  11.         return parentheses_close.index(c)
  12.     else:
  13.         return 0
  14.  
  15. def validateSyntax(x):
  16.     size = len(x)
  17.     s = []
  18.     for i in range(0, size):
  19.         if x[i] in parentheses_open:
  20.             s.append(x[i])
  21.         elif x[i] in parentheses_close:
  22.             if len(s)==0:
  23.                 return 0
  24.             if getParenthesesType(s.pop()) != getParenthesesType(x[i]):
  25.                 return 0
  26.     if len(s)==0:
  27.         return 1
  28.     else:
  29.         return 0
  30.  
  31. if validateSyntax(code):
  32.     print("Valid")
  33. else:
  34.     print("Wrong")

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