Merge pull request #1232 from ivan1016017/april06

adding valid palindrome

Author: ivanpenaloza

src/my_project/interviews/top_150_questions_round_15/valid_palindrome.py

@@ -0,0 +1,21 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+import re 
+
+class Solution:
+    def isPalindrome(self, s: str) -> bool:
+
+        # to lower case
+        s = s.lower()
+
+        # remove non-alphanumeric characters
+        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_15/test_valid_palindrome_round_15.py

@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_15\
+.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)