Update 9.md

jackzhenguo · web-flow · commit 126d01f7b6ae · 2021-10-03T20:11:50.000+08:00
diff --git a/md/9.md b/md/9.md
@@ -17,6 +17,7 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+浮点数最大值
 ```python
 import sys
 
