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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]
+
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=9
+num=9
+num1=20
+mid1=(low+high)//2
+mid=(low+high)//2
+guss=num_list[mid]
+while guss==num or low>high:   
+    if guss<num:
+        low=mid+1       
+    else:
+        high=mid-1
+if low>high:
+    mid=0
+while guss==num1:
+    if guss<num1:
+        low=mid1+1
+    else:
+        high=mid1-1
+if mid==0:
+    print("找不到"+"9的索引")
+print()
+
+