save project

my_search.py

@@ -6,4 +6,19 @@ for i in range(1, 101):
 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
+def binary_search(alist,num):
+    left = 0
+    right = len(alist)-1
+    while True:
+        if right < left:
+            return "没有"
+        mid = (left+right)//2
+        sb = alist[mid]
+        if sb < num:
+            left = mid+1
+        elif sb == num:
+            return mid
+        else:
+            right = mid+1    
+print(num)        
+print(binary_search(alist,num))
\ No newline at end of file