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binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
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+bing=20 #需要找的数
+low=0
+high=len(num_list)-1
+
+while low<=high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess == bing:
+        print("找到了，他在列表的索引是：",mid)
+        break
+    elif guess<num_list[mid]:
+        low=mid+1
+    elif guess>num_list[mid]: 
+        high=mid-1
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