save project

diy.py

 with open(r"c:\Users\蔡沛希\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8")as a:
     d=a.readlines()
+    l = []
     for i in d:
         date=i.split()
         sum = 0       
         for j in date[1:]:
             sum += int(j)
-        b=date[0] + str(sum)
-        print(b)
+        b=date[0] + str(sum) + "\n"
+        l.append(b)