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()
     a=file.readlines()
+
+final_sum=[]
 for i in a:
 for i in a:
     data=i.split()
     data=i.split()
     sum=0
     sum=0
@@ -8,5 +10,5 @@ for i in a:
     result=data[0]+str(sum)+'\n'
     result=data[0]+str(sum)+'\n'
     final_sum.append(result)
     final_sum.append(result)
 
 
-with open(r'c:\Users\Administrator\Desktop\new_sales_list.txt','r',encoding='utf-8')as file:
+with open(r'c:\Users\Administrator\Desktop\new_sales_list.txt','a',encoding='utf-8')as file:
     file.writelines(final_sum)
     file.writelines(final_sum)
\ No newline at end of file