save project

my_search.py

 import random
-
 alist = []
 for i in range(1, 101):
     alist.append(i)
 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):
+    high = len(alist)-1
+    low = 0
+    mid = 0
+    while high > low:
+        mid = (low + high) // 2
+        if alist[mid] == num:
+            print("找到了"+str(num)+"在索引值为"+str(mid))
+            break
+        elif alist[mid] < num:
+            low = mid + 1
+        else:
+            high = mid - 1
+    # print(str(num)+"在列表中不存在")
+binary_search(alist,num)
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