Update 13.md

VortexRiderV2 · Aug 15, 2021 · fe458cd · fe458cd
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diff --git a/md/13.md b/md/13.md
@@ -6,11 +6,13 @@
 
 #### 13 链式比较
 
+Python支持这种连续不等比较，写起来更方便
+
 ```python
 i = 3
 print(1 < i < 3)  # False
 print(1 < i <= 3)  # True
 ```
 
 
-<center>[上一个例子](12.md)    [下一个例子](14.md)</center>
+<center>[上一个例子](12.md)    [下一个例子](14.md)</center>