adding valid palindrome

Author: ivanpenaloza

src/my_project/interviews/top_150_questions_round_14/valid_palindrome.py

@@ -0,0 +1,22 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+import re 
+
+class Solution:
+    def isPalindrome(self, s: str) -> bool:
+
+        # transform to lower case
+        s = s.lower()
+
+        # remove non-alphanumerical value in the string
+        s = re.sub(pattern='[^a-zA-Z0-9]', 
+                   repl='',
+                   string=s)
+        
+        len_s = len(s)
+
+        for i in range(len_s//2):
+            if s[i] != s[len_s - 1 - i]:
+                return False 
+            
+        return True

tests/test_150_questions_round_14/test_find_valid_palindrome_round_14.py

@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_14\
+.valid_palindrome import Solution
+
+class ValidPalindromeTestCase(unittest.TestCase):
+
+    def test_is_valid_palindrome(self):
+        solution = Solution()
+        output = solution.isPalindrome(s="A man, a plan, a canal: Panama")
+        self.assertTrue(output)
+
+    def test_is_no_valid_palindrome(self):
+        solution = Solution()
+        output = solution.isPalindrome(s="race a car")
+        self.assertFalse(output)