diff --git a/工具v2/database_tools.py b/工具v2/database_tools.py
index 7da78ca0..c8e03504 100644
--- a/工具v2/database_tools.py
+++ b/工具v2/database_tools.py
@@ -148,21 +148,6 @@ def spareIDs(dictname): #返回空闲题号
     output += "首个空闲id: %s, 直至: %s"%(str(int(used_list[-1][-6:])+1).zfill(6),"999999")
     return output #返回的是一个多行的字符串, 每一行中含有一个空闲题号的闭区间
 
-def parse_usage(datastring): #对单个usages中的项的结果进行分词
-    datastring = re.sub(r"\s+","\t",datastring.strip())
-    datalist = datastring.split("\t")
-    date = ""
-    classname = ""
-    diff = []
-    for item in datalist:
-        if not "." in item and not "高" in item and not "班" in item:
-            date = item
-        elif "高" in item or "班" in item:
-            classname = item
-        else:
-            diff.append(item)
-    return({"date":date,"classname":classname,"difficulty":diff}) #返回一个字典, "date"表示日期, "classname"表示班级, "difficultiy"表示难度列表
-
 
 def GenerateProblemListFromString(data): #从来自.tex文件的字符串生成题目列表, 每个item是一道题目, 新一行的%用作前缀
     try: