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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
+high=len(num_list)-1
+low=0
+mid=(high+low)//2
+n=20
+    
+while True:
+    if num_list[mid]<n:
+        low=mid+1
+        
+    elif num_list[mid]>n:
+        high=mid-1
+        
+    elif num_list[mid]==n:
+        print('找到'+str(n)+'了，索引为'+'str(mid)')
+        break 
+    elif high<=low:
+        print('找不到'+'n'+',嘿嘿嘿～')
+        break