auto save

diy.py

 with open (r'c:\Users\Administrator\Documents\lesson13-4\sales_list.txt','r',encoding='utf-8')as file:
 with open (r'c:\Users\Administrator\Documents\lesson13-4\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
     for sales in data[1:]:
     for sales in data[1:]:
         sum=sum+int(sales)
         sum=sum+int(sales)
-    result = data[0]+str(sum)+
-    print(result)
+    result = data[0]+str(sum)+'\n'
+    final_sum.append(result)
\ No newline at end of file
+with open (r'c:\Users\Administrator\Documents\lesson13-4\sales_list.txt','a',encoding='utf-8')as file:
+    file.writelines(final_sum)
\ No newline at end of file