auto save

diy.py

-with open("C:\Users\刘翔\Desktop\sales_list.txt",encoding="UTF-8")as file:
+with open(r"C:\Users\刘翔\Desktop\sales_list.txt",'r',encoding="UTF-8")as file:
     a=file.readlines()
     a=file.readlines()
     #print(a)
     #print(a)
 final_sum=[]
 final_sum=[]
@@ -9,8 +9,8 @@ for i in a:
         sum=sum+int(selse)
         sum=sum+int(selse)
     result=data[0]=str(sum)+"\n"
     result=data[0]=str(sum)+"\n"
     final_sum.append(result) 
     final_sum.append(result) 
-with open("C:\Users\刘翔\Desktop\sales_list.txt",encoding="UTF-8")as file:
-    file.wirtelines(final_sum)
+with open(r"C:\Users\刘翔\Desktop\sales_list.txt",'a',encoding="UTF-8")as file:
+    file.writelines(final_sum)