save project

diy.py

 with open(r'c:\Users\admin\Desktop\sale.txt','r',encoding='utf-8')as file:
     a=file.readlines()
     #print(a)
+    c=[]
     for i in a:
         deta=i.split()
         sum=0
@@ -8,6 +9,13 @@ with open(r'c:\Users\admin\Desktop\sale.txt','r',encoding='utf-8')as file:
             sum=sum+int(sale)
         b=str(sum)
         print(deta[0]+b)
+        c.append(deta[0]+b+"\n")
+        
+        
+with open(r'c:\Users\admin\Desktop\sale.txt','w',encoding='utf-8')as file:
+    file.writelines(c)
+
+