Обновить u6/matching_brackets.py

u6/matching_brackets.py

@@ -1,8 +1,8 @@
 def is_paired (input_string):
     pairs = {")": "(", "]": "[", "}": "{"}
     stack = []
-    for char input_string:
+    for char in input_string:
         if char in opening:
             stack.append(char)
-        return stack
+        return not stack