save project

diy.py

@@ -9,4 +9,4 @@ for i in b:
     r=data[0]+str(sum)+'\n'   
     f.append(r)         
 with open(r"c:\Users\Administrator\Documents\lesson13-5\new_saleslist.txt","a",encoding='utf-8') as a:
-    a.readlines(f)
\ No newline at end of file
+    a.writelines(f)
\ No newline at end of file