save project

binary_search.py

 # 使用二分查找法，找出20在列表里面的索引
 # 使用二分查找法，找出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]
-high=0
+low=0
 num=20
 num=20
 high=len(num_list)-1
 high=len(num_list)-1
-mid=(low+high)//2
-guess=num_list[mid]
-if guess==num:
-    print("找到了")
-elif guess<num:
-    low=mid+1
-else:
-     high=mid-1    
+
+while low<=high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess==num:
+        print("找到了")
+        break
+    elif guess<num:
\ No newline at end of file
+        low=mid+1
+    else:
+        high=mid-1    
\ No newline at end of file