auto save

diy.py

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