auto save

diy.py

 with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8') as ftkt:
     ofi=ftkt.readlines() 
-
+final_sum=[]
 for i in ofi:
     data=i.split()
     #print(data[1:])
     sum=0
     for sales in data[1:]:
         sum=sum+int(sales)
-    result=data[0]+str(sum)
-    print(result)
-
-
+    result=data[0]+str(sum)+'\n'
+    
+with open(r'c:\Users\Administrator\Documents\lesson13-1\sales_list.txt','a',encoding='utf-8') as ftkt:   
+    ftkt.lines(readlines)