diff --git a/problems/0202.快乐数.md b/problems/0202.快乐数.md
index 1a7d53a3..2687574f 100644
--- a/problems/0202.快乐数.md
+++ b/problems/0202.快乐数.md
@@ -132,6 +132,19 @@ class Solution:
             else:
                 record.add(n)
 
+# python的另一种写法 - 通过字符串来计算各位平方和
+class Solution:
+    def isHappy(self, n: int) -> bool:
+        record = []
+        while n not in record:
+            record.append(n)
+            newn = 0
+            nn = str(n)
+            for i in nn:
+                newn+=int(i)**2
+            if newn==1: return True
+            n = newn
+        return False
 ```
 
 Go：