save project

diy.py

 with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8") as file1:
     a=file1.readlines()
     print(a)
+daji=[]
 for i  in a:
     #print(i)
     ab=i.split()
@@ -11,6 +12,8 @@ for i  in a:
         #print(qian)
         sum+=int(qian)
     print(sum)
-    ab[0]+str(sum)
-    print(ab[0]+str(sum))
-
+    q=ab[0]+str(sum)+"\n"
+    #print(ab[0]+str(sum))
+    daji.append(q)
+with open(r"c:\Users\Administrator\Documents\lesson13-1\sales_list.txt","a",encoding="utf-8") as filel2:
+    filel2.writelines(daji)