save project

diy.py

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

sales_list.txt

+with open(r'"C:\Users\Administrator\Desktop\sales_list.txt",'r'encoding='utf-8')as file:
+file.read("sales_list.txt")
\ No newline at end of file