Written a function for Palindrome checker

maths/is_string_palindrome.py

@@ -0,0 +1,52 @@
+import re
+
+
+def is_string_palindrome(words: str) -> bool:
+    """
+    Returns whether `words` is a palindrome or not.
+
+    >>> is_string_palindrome("-121")
+    False
+    >>> is_string_palindrome("0")
+    True
+    >>> is_string_palindrome("10")
+    False
+    >>> is_string_palindrome("11")
+    True
+    >>> is_string_palindrome("101")
+    True
+    >>> is_string_palindrome("120")
+    False
+    >>> is_string_palindrome(120)
+    False
+    >>> is_string_palindrome("madam")
+    True
+    >>> is_string_palindrome("racecar")
+    True
+    >>> is_string_palindrome("hello")
+    False
+    >>> is_string_palindrome("A man a plan a canal Panama")
+    True
+    >>> is_string_palindrome("")
+    True
+    >>> is_string_palindrome("noon")
+    True
+    >>> is_string_palindrome("Was it a car or a cat I saw")
+    True
+    >>> is_string_palindrome("Python")
+    False
+    >>> is_string_palindrome(" ")
+    True
+    """
+    words = str(words)
+    cleaned_phrase = re.sub(r"[^a-zA-Z0-9]", "", words).lower()
+    if words.startswith("-"):
+        return False
+
+    return cleaned_phrase == cleaned_phrase[::-1]
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()