problem solution & test 0009

Author: codewithme-py

solutions/palindrome_number_0009.py

@@ -0,0 +1,9 @@
+class Solution:
+    def isPalindrome(self, x: int) -> bool:
+        if x < 0 or (x % 10 == 0 and x != 0):
+            return False
+        reversed_half = 0
+        while x > reversed_half:
+            reversed_half = reversed_half * 10 + (x % 10)
+            x //= 10
+        return x == reversed_half or x == reversed_half // 10

tests/test_palindrome_number_0009.py

@@ -0,0 +1,11 @@
+from solutions.palindrome_number_0009 import Solution
+
+def test_is_palindrome():
+    sol = Solution()
+    assert sol.isPalindrome(121) == True
+    assert sol.isPalindrome(-121) == False
+    assert sol.isPalindrome(10) == False
+    assert sol.isPalindrome(0) == True
+    assert sol.isPalindrome(1221) == True
+    assert sol.isPalindrome(12321) == True
+    assert sol.isPalindrome(123) == False