noqa to silence flake8 on Python 3 only syntax

Author: cclauss

Diff for: data_structures/Trie/Trie.py

@@ -21,7 +21,7 @@ def insert_many(self, words: [str]):
         for word in words:
             self.insert(word)
 
-    def insert(self, word: str):
+    def insert(self, word: str):  # noqa: F821 This syntax is Python 3 only
         """
         Inserts a word into the Trie
         :param word: word to be inserted