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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
+a=9
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-a=20
 low=0
 low=0
 high=len(num_list)-1
 high=len(num_list)-1
 while low<=high:
 while low<=high:
     mid=(low+high)//2
     mid=(low+high)//2
     mun=num_list[mid]
     mun=num_list[mid]
-    if mun2 ==a:
-        print("ZHAO DAO LE",mid)
+    if  a not in num_list:
+        print("列表中没有9")
         break
         break
+       
     elif mun<a:
     elif mun<a:
         low=mid+1
         low=mid+1
     elif mun>a:
     elif mun>a: