auto save

diy.py

 with open(r'C:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8') as file:
 with open(r'C:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8') as file:
-    a=file.readlines()
-sum=0    
+    a=file.readlines()  
 bbb=[]
 bbb=[]
 for i in a:
 for i in a:
     data=i.split()
     data=i.split()
+    sum=0
     for sales in data[1:]:
     for sales in data[1:]:
         sum=sum+int(sales)
         sum=sum+int(sales)
-    result=data[0]+str(sum)+'\n'
-    bbb.append(result)
-with open(r'C:\Users\Administrator\Desktop\sales_list.txt','',encoding='utf-8') as file:
-    file.writelines()    
-
+    aaa=data[0]+str(sum)+'\n'
+    bbb.append(aaa)
+with open(r'C:\Users\Administrator\Desktop\sales_list.txt','a',encoding='utf-8') as file:
+    file.writelines(bbb)