Added optimized code for checking balanced paranthesis in python3

Author: captainaadesh

Balanced Pranthesis stack problem/Balanced_paranthesis_optimized.py

@@ -0,0 +1,26 @@
+# Optimized Python3 code to Check for balanced parentheses in an expression 
+open_list = ["[","{","("] 
+close_list = ["]","}",")"] 
+
+# Function to check parentheses 
+def check(myStr): 
+	stack = [] 
+	for i in myStr: 
+		if i in open_list: 
+			stack.append(i) 
+		elif i in close_list: 
+			pos = close_list.index(i) 
+			if ((len(stack) > 0) and
+				(open_list[pos] == stack[len(stack)-1])): 
+				stack.pop() 
+			else: 
+				return "Unbalanced"
+	if len(stack) == 0: 
+		return "Balanced"
+
+# Driver code 
+string = "{[]{()}}"
+print(string,"-", check(string)) 
+
+string = "[{}{})(]"
+print(string,"-", check(string))