save project

binary_search.py

@@ -6,10 +6,19 @@ high = len(num_list)-1
 while low <= high:
     mid =(low+high)//2
     guess_num = num_list[mid]
-    if guess_num == bingo_num:
-        print("找到了， 它在列表里索引是: ",mid)
-        break
-    elif guess_num < bingo_num:
-        low = mid +1
-    elif guess_num > bingo_num:
-        low = mid -1
\ No newline at end of file
+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("他在列表里的索引是: ", result)