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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
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+num_list = [1, 3, 5, 9, 11, 15, 17, 18, 20, 21]
+
+def cheak_num(list,num):
+    guess=list[(len(list)-1)//2]
+    mid=(len(list)-1)//2
+    low=0
+    high=len(list)-1
+    while low<=high:
+        if guess==num:
+            print('找到'+num+'索引是'+mid)
+            break
+        if guess>num:
+            high=mid-1
+        else:
+            low=mid+1
+    print('没找到目标值')
+cheak_num(num_list,20)