save project

diy.py

 with open(r'c:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8') as i:
     a=i.readlines()
+    p=[]
     for b in a:
         date=b.split()
         #print(date[0])
-
+       
         #print(date[1:])
         sum=0
         for sales in date[1:]:
             sum=sum+int(sales)
-        result=date[0]+str(sum)
-        print(result)
\ No newline at end of file
+        result=date[0]+str(sum)+'\n'
+        p.append(result)
+        with open(r'c:\Users\Administrator\Desktop\sales_list.txt','a',encoding='utf-8') as i:
+            i.writelines(p)