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binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+bingo_num = 20
+low = 0
+high = len(num_list)-1
+#当最低数值索引小于等于最高数值的时候
+while low <= high:
+    #取出列表中间数值的索引值  //取整
+    mid = (low+high) // 2
+    guess_num = num_list[mid] #猜测的数值
+    if guess_num == bingo_num:
+        print("找到了，它在列表中的索引值是：",mid)
+        break
+    elif guess_num < bingo_num:
+        low = mid + 1
+    else:
+        high = mid -  1
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