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my_search.py

@@ -4,6 +4,21 @@ alist = []
 for i in range(1, 101):
 for i in range(1, 101):
     alist.append(i)
     alist.append(i)
 num = random.choice(alist)
 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
+# 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szszszszszszszszszss唐老师
 
 
-def binary_search(alist,num):
+def binary_search(alist,num):
\ No newline at end of file
+    step = 0  # 记录查找次数
+    flag1 = len(alist)-1  #目标区域左边界
+    while step <= flag1: #区间数据范围小于1则结束循环
+        mid = (step + flag1) // 2 # 中间值
+        cds = alist[mid]
+
+        if cds == num:
+            return mid
+        elif cds < num:
+            step = mid + 1 #左边界后移
+        else:
+            flag1 = mid - 1
+
+a = binary_search(alist,num)
+print(num)