Update 0125-valid-palindrome.py

Author: lucasarano

python/0125-valid-palindrome.py

@@ -1,21 +1,7 @@
 class Solution:
     def isPalindrome(self, s: str) -> bool:
-        l, r = 0, len(s) - 1
-        while l < r:
-            while l < r and not self.alphanum(s[l]):
-                l += 1
-            while l < r and not self.alphanum(s[r]):
-                r -= 1
-            if s[l].lower() != s[r].lower():
-                return False
-            l += 1
-            r -= 1
-        return True
-
-    # Could write own alpha-numeric function
-    def alphanum(self, c):
-        return (
-            ord("A") <= ord(c) <= ord("Z")
-            or ord("a") <= ord(c) <= ord("z")
-            or ord("0") <= ord(c) <= ord("9")
-        )
+        new = ''
+        for a in s:
+            if a.isalpha() or a.isdigit():
+                new += a.lower()
+        return (new == new[::-1])