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binary_search.py

+import random
+alist=[]
 # 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
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+for i in range(1,101):
+    alist.append(i)
+num=random.choice(alist)
+
+
+def search(alist,num): 
+    low=0
+    high=len(alist)-1
+    while low <= high:
+        #中间 二分查找的
+        mid = (high + low) //2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low = mid+1
+        else:
+            high = mid-1
+
+result=search(alist,num)
+print("老师给得值是",num)
+print("它在列表索引是",result)
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