add test file for workflow

l_125_valid_palindrome.py

@@ -0,0 +1,18 @@
+class Solution:
+    def isPalindrome(self, s: str) -> bool:
+        s = [an.lower() for an in s if an.isalnum()]
+        if len(s) & 1 == 1:
+           front = "".join(s[:len(s)//2][::-1])
+           back = "".join(s[len(s)//2+1:]) 
+        else:
+            front = "".join(s[:len(s)//2][::-1])
+            back = "".join(s[len(s)//2:])
+
+        if front == back:
+            return True
+        return False
+
+s = Solution()
+print(s.isPalindrome("A man, a plan, a canal: Panama"))
+print(s.isPalindrome("A"))
+print(s.isPalindrome(" "))