save project

binary_search.py

+bingo_num = 20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+
+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(num_list,20)
+print(result)

diy2.py

-bingo_num = 20
-num_list = [1,3,5,8,11,15,17,18,20,21]
-
-low = 0 
-high = len(num_list)-1
-while low <= high:
-    mid = (low + high) // 2
-    guess = num_list[mid]
-    if guess == bingo_num:
-        print("找到了，它的索引是：",mid)
-        break
-    elif guess < bingo_num:
-        low = mid + 1
-    else:
-        high = mid - 1