save project

my_search.py

@@ -6,4 +6,19 @@ for i in range(1, 101):
 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
 
 
-def binary_search(alist,num):
+def binary_search(alist,num):
\ No newline at end of file
+    a=0
+    b=len(alist)-1
+    while a<=b:
+        c=(a+b)//2
+        d=alist[c]
+        if d==num:
+            print("找到了")
+            print(c)
+            break
+        elif d<num:
+            a=d+1
+        elif d>num:
+            b=d-1
+    return None
+e=binary_search(alist,9)
\ No newline at end of file