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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]
\ No newline at end of file
+low=0
+high=len(num_list)-1
+num=17
+while low <= high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess ==num :
+        print("找到了，他的索引是",mid)
+        break
+    elif guess<num:
+        low = mid+1
+    else:
+        high = mid-1
+else:
+    print("没找到")
+