auto save

my_search.py

+# 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):
+    low = 0
+    high = len(alist)-1
+    while high<low:
+        mid = (low+high)//2
+        a = alist[mid]
+        if a == num:
+            return mid
+        elif a<num:
+            low = mid + 1
+        else:
+            high = mid - 1
 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
+print(binary_search(alist,num))
+
 
-def binary_search(alist,num):
\ No newline at end of file