save project

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]
+low=0
+high=len(num_list-1)
 mid=(low+high)//2
 mid=(low+high)//2
 guess=num_list[mid]
 guess=num_list[mid]
-if guess==17:
-    print("找到了！")
-elif guess<17:
-    
+while True:
+    if guess==17:
+        print("找到了！")
+        break
+    elif guess<17:
+        low=mid+1
+    else:
+        high=mid-1
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