save project

diy.py

 with open(r'c:\Users\l\Desktop\sales_list.txt',"r",encoding='utf-8') as file:
     a=file.readlines()
-final_sum=[]
+    sss=[]
 for i in a:
     newdata=i.split()
     #print(newdata[0])
@@ -8,10 +8,12 @@ for i in a:
     sum=0
     for sales in newdata[1:]:
         sum=sum+int(sales)
-    ljtyyzs=newdata[0]+str(sum)
-    final_sum.append(ljtyyzs)
-with open(r'c:\Users\l\Desktop\sales_list.txt',"r",encoding='utf-8') as file:
-    a=file.writelines(ljtyyzs)
+    ljtyyzs=newdata[0]+str(sum)+'\n'
+    sss.append(ljtyyzs)
+with open(r'c:\Users\l\Desktop\sales_list.txt',"a",encoding='utf-8') as file:
+    file.writelines('\n')
+    file.writeline(sss)
+