save project

my_search.py

@@ -8,4 +8,18 @@ num = random.choice(alist)
 
 def binary_search(alist,num):
     low=0
+    high = len(alist)-1
+    while low <high:
+        mid = (low+high)//2
+        guess = alist[mid]
+        if guess == num:
+            return mid
+        elif guess < num:
+            low = mid + 1
+        else:
+            high = mid-1
+    return None
+result = binary_search(alist,num)
+print("老师给的数是",num)
+print("索引是",result)
     
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