Add python solution code for leetcode No.9.

Author: yanglr

Diff for: leetcode-009/leetcode009.py

@@ -0,0 +1,14 @@
+class Solution:
+    def isPalindrome(self, x: int) -> bool:
+        if x < 0:
+            return False
+        else:
+            str0 = str(x)
+            reversedStr = str0[::-1]
+            if reversedStr == str0:
+                return True
+        return False
+        
+# Below is testing
+sol = Solution()
+print(sol.isPalindrome(616))