save project

my_search.py

@@ -6,4 +6,20 @@ for i in range(1, 101):
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
-def binary_search(alist,num):
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+# def binary_search(alist,num):
+bingo_num = num      # 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 = num_list[mid]   # 猜测的数值
+    if guess_num == bingo_num:
+        print("找到了，它在列表里的索引是：", mid)
+        break
+    elif guess_num < bingo_num:
+        low = mid+1
+    elif guess_num > bingo_num:
+        high = mid-1
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