Python code for testing well parenthesized expression

[Martin P. Hellwig]

candide wrote:
To add to your implementations; a readable version:

+++file parantheses.py+++
"""Parentheses Module Test"""

def parentheses_are_paired(input_string):
     "Check if 'input_string' contains paired parentheses, if so return 
True."
     parenthesis_count = 0
     parenthesis_open = '('
     parenthesis_close = ')'

     for character in input_string:
         if character == parenthesis_open:
             parenthesis_count += 1
         elif character == parenthesis_close:
             parenthesis_count -= 1


     if parenthesis_count == 0:
         return(True)
     else:
         if parenthesis_count < 0:
             error_text = 'More closing parantheses than opening ones'

         elif parenthesis_count > 0:
             error_text = 'More opening parantheses than closing ones'

         raise(ValueError(error_text))

if __name__ == '__main__':
     TEST_TRUE = 'zx4er(1(er(Yy)ol)ol)ik'
     TEST_ERROR = 'zx(4er(1(er(Yy)ol)ol)ik'

     print(parentheses_are_paired(TEST_TRUE))

     try:
         print(parentheses_are_paired(TEST_ERROR))
     except(ValueError):
         print(False)

---file parantheses.py---

-- 
MPH
http://blog.dcuktec.com
'If consumed, best digested with added seasoning to own preference.'