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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
+low=0
+high=len(num_list)-1
+n=int(input("请输入要找的数字"))
+while 1:
+    high = len(num_list)-1
+    mid=(low+high)//2
+    num=num_list[mid]
+    if num==20:
+        print(mid)
+    elif num<n:
+        low=mid+1
+    else:
+        high=mid-1
+        break
\ No newline at end of file