Lists moved outside the function

paranthesis.py

@@ -1,6 +1,6 @@
+openingParanthesisList=['(','{','[']
+closingParanthesisList=[')','}',']']
 def checkBalance(expression):
-    openingParanthesisList=['(','{','[']
-    closingParanthesisList=[')','}',']']
     stack=[]
     for char in expression:
         if char in openingParanthesisList:

validator.py

@@ -0,0 +1,30 @@
+class Validator:
+    parantheses_dict={
+                    '(':')',
+                    '{':'}',
+                    '[':']'
+                    }
+
+    def check_parantheses_balance(self,expression):
+        parantheses_stack=[]
+        for char in expression:
+            if char in self.parantheses_dict.keys():
+                parantheses_stack.append(char)
+            elif char in self.parantheses_dict.values():
+                if len(parantheses_stack)!=0:
+                    popped_parentheses=parantheses_stack.pop()
+                    if self.parantheses_dict[popped_parentheses]!=char:
+                        return False
+                else:
+                    return False
+        return len(parantheses_stack)==0
+
+def main():
+    expression_one="(){}}"
+    expression_two="(){}"
+    validator_object=Validator()
+    print("{} : {}".format(expression_one,validator_object.check_parantheses_balance(expression_one)))
+    print("{} : {}".format(expression_two,validator_object.check_parantheses_balance(expression_two)))
+
+if __name__=='__main__':
+    main()