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my_search.py

@@ -6,9 +6,9 @@ for i in range(1, 101):
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 def binary_search(alist,num):
-    low=0
+    low=0            #定义变量
     high=len(alist)-1      
-    while low <= high:
+    while low <= high:           #
         mid=(low+high)//2        
         guess=alist[mid]
         if guess==num: