save project

my_search.py

 import random
 
+
+# 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):
+    mi=0
+    mx=len(alist)-1
+    while mi<mx:
+        mid=(mi+mx)//2
+        gis =alist[mid]
+        if num==gis:
+            return mid
+        elif num>gis:
+            mi=mid+1
+        else:
+            mx=mid-1
+    return None
 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):
\ No newline at end of file
+print(binary_search(alist,num))