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my_search.py

@@ -6,4 +6,16 @@ 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):
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+def binary_search(alist,num):
+    low = 0
+    high = len(num_list)
+    while low <=hight:
+        mid = (low+high)//2
+        b_num = num_list[mid]
+        if b_num = a_num:
+            return mid
+        elif b_num < a_num:
+            low = mid+1
+        else:
+            high = mid - 1
+return None
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