save project

diy.py

-with open(r'C:\Users\A32\Desktop\sales_list.txt','r',encoding='utf-8') as file:
+with open(r'C:\Users\A32\Desktop\sales_list.txt','a',encoding='utf-8') as file:
     a=file.readlines()
     a=file.readlines()
+final_sum=""
 for i in  a:
 for i in  a:
     data=i.split()
     data=i.split()
   
   
@@ -11,4 +12,4 @@ for i in  a:
     final_sum.append(result)
     final_sum.append(result)
 
 
     with open(r'C:\Users\A32\Desktop\erdt_list.txt','r',encoding='utf-8') as file:
     with open(r'C:\Users\A32\Desktop\erdt_list.txt','r',encoding='utf-8') as file:
-        file.writelines(final   sum)
+        file.writelines(finalsum)