diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..13566b8
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/src/leecode/python/9.回文数.py b/src/leecode/python/9.回文数.py
new file mode 100644
index 0000000..6e500ae
--- /dev/null
+++ b/src/leecode/python/9.回文数.py
@@ -0,0 +1,26 @@
+#
+# @lc app=leetcode.cn id=9 lang=python3
+#
+# [9] 回文数
+#
+
+# @lc code=start
+
+# 偶数位 123321
+# 12332 1233  123
+# 1     12    123
+
+# 奇数位 121
+# 12 1
+# 1  12
+class Solution:
+    def isPalindrome(self, x: int) -> bool:
+       if x < 0 or (x % 10 == 0 and x != 0):
+           return False
+       res = 0
+       while res < x:
+           res = res * 10 + x % 10
+           x //= 10
+       return res == x or res // 10 == x
+# @lc code=end
+