auto save

diy.py

+with open(r'C:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8') as file:
+    a=file.readlines()
+sum=0    
+bbb=[]
+for i in a:
+    data=i.split()
+    for sales in data[1:]:
+        sum=sum+int(sales)
+    result=data[0]+str(sum)+'\n'
+    bbb.append(result)
+with open(r'C:\Users\Administrator\Desktop\sales_list.txt','',encoding='utf-8') as file:
+    file.writelines()    
+

sales_list.txt

+with open(r'C:\Users\Administrator\Desktop\sales_list.txt','r',encoding='utf-8') as file:
+file.read()
+