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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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num=input()
+num=int(num)
+high=len(num_list)-1
+low=0
+while low<=high:
+    a=(high+low)//2
+    if num_list[a]==num:
+        print(a,num)
+        exit()
+    elif num>num_list[a]:
+        low=a+1
+        a=(high+low)//2
+    else:
+        high=a-1
+        a=(high+low)//2
+print('gun')
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