save project

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 = num_list[mig]
+    if guess_num == binbo_num:
+        print("找到了，它在列表里的索引是：",mid)
+        break
+    elif guess_num < binbo_num:
+        low = mid + 1
+    elif guess_num > binbo_num:
+        high = mid - 1