save project

my_search.py

@@ -3,7 +3,26 @@ import random
 alist = []
 for i in range(1, 101):
     alist.append(i)
-num = random.choice(alist)
+n = 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
+def bs(alist,num):
+    l=0
+    h=len(alist)-1
+    while l<=h:
+        m=(l+h)//2
+        g= alist[m]
+        if g==n:
+            return m
+        elif g<n:
+            l=m+1
+        else:
+            h=m-1
+    return None
+r=bs(alist,n)            
+print("数字:",n)
+print("索引值:",r)            
+              
+
+
+