Lists moved outside the function

class.py

@@ -0,0 +1,35 @@
+class ValidatorClass:
+    opening_parantheses_list=['(','{','[']
+    closing_parantheses_list=[')','}',']']
+
+    def __init__(self,expression):
+        self.expression=expression
+        self.parantheses_stack=[]
+
+    def check_balance(self):
+        for char in self.expression:
+            if char in self.opening_parantheses_list:
+                self.parantheses_stack.append(char)
+            elif char in self.closing_parantheses_list:
+                index=self.closing_parantheses_list.index(char)
+                if len(self.parantheses_stack)!=0:
+                    if self.opening_parantheses_list[index]==self.parantheses_stack[len(self.parantheses_stack)-1]:
+                        self.parantheses_stack.pop()
+                    else:
+                        return False
+                else:
+                    return False
+        if len(self.parantheses_stack)==0:
+            return True
+
+def main():
+    expression_one="(){}}"
+    expression_two="(){}"
+    validator_object_one=ValidatorClass(expression_one)
+    validator_object_two=ValidatorClass(expression_two)
+    #flag=validator_object_one.check_balance()
+    print("%s : %r" % (expression_one,validator_object_one.check_balance()))
+    print("%s : %r" % (expression_two,validator_object_two.check_balance()))
+
+if __name__=='__main__':
+    main()

paranthesis.py

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