save project

diy.py

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