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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]
+bingo_num = 9
+low = 0
+hight = len(num_list) - 1
+while low <= hight:
+    mid = (low + hight)//2
+    zjs_num = num_list[mid]
+    if zjs_num == bingo_num :
+        print('找到了，在列表中的索引是:',mid)
+        break
+    elif zjs_num < bingo_num:
+        low = mid + 1
+    elif zjs_num > bingo_num:
+        hight = mid - 1
+print('列表里没有',bingo_num)
+