auto save

my_window.py

-import tkinter
+# 什么都没有输出，说明不在列表里
+a = 20      # 要查找的数：20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
+high = len(num_list)-1
 
+# 当最低价格索引，小于等于最高价格时
+while low <= high:
+    mid = (low+high) // 2 #取中间价格的索引位置   //取整
+    guess = num_list[mid]   # 猜测的数值
+    if guess == a:
+        print("找到了，它在列表里的索引是：", mid)
+        break
+    elif guess< a:
+        low = mid+1
+    elif guess > a:
+        high = mid-1
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