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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
 # 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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+mb = 11
+
+left=0
+right=len(num_list)-1
+while left<right:
+    mid = (left+right)//2
+    guess = num_list[mid]
+    if guess == mb:
+        print("找到了,索引是",mid)
+        break
+    elif guess<mb:
+        left = mid + 1
+    elif guess>mb:
+        right = mid - 1
+
+
+
+
+
+
+