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my_search.py

@@ -6,4 +6,21 @@ 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):
+    ok = num
+    low = 0
+    high = len(alist)-1
+
+    while low < high:
+        mid =( low + high ) // 2
+        guess = alist[ mid ]
+        if guess == ok:
+            print("猜对了，索引位置是",mid)
+            return
+            break
+        elif guess < ok :
+            low = mid + 1
+        else:
+            high = mid - 1
+    return
+binary_search( alist , num )
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