diff --git a/getdata.py b/getdata.py
index d18b888..e4902ba 100644
--- a/getdata.py
+++ b/getdata.py
@@ -21,4 +21,13 @@ def openreadtxt(file_name):
         tmp_list[-1] = tmp_list[-1].replace('\n', '')  # 去掉换行符
         data.append(tmp_list)  # 将每行数据插入data中
     file.close()
-    return data
\ No newline at end of file
+    return data
+
+def updateFile(file, old_str, new_str):
+    with open(file, "r", encoding="utf-8") as f1, open("%s.bak" % file, "w", encoding="utf-8") as f2:
+        for line in f1:
+            f2.write(re.sub(old_str, new_str, line))
+    os.remove(file)
+    os.rename("%s.bak" % file, file)
+    f2.close()
+    f1.close()
\ No newline at end of file