auto save

diy.py

-#a=file  b=a   c=data   d=sum   e=sales   f=result
+#a=file  b=a   c=data   d=sum   e=sales   f=result   g=final_sum
 with open(r'c:\Users\Windows 7\Documents\lesson13-1\sales_list.txt','r',encoding='utf-8')as  a:
     b=a.readlines()
-#     print(b)
+g=[]
 for i in b:
     c=i.split()
     d=0
     for e in c[1:]:
         d=d+int(e)
-    f=c[0]+str(d)
-    print(f)
\ No newline at end of file
+    f=c[0]+str(d)+'\n'
+    g.append(f)
+with open (r'c:\Users\Windows 7\Desktop\新建文件夹 (3)\c.txt','w',encoding='utf-8') as a:
+    a.writelines(g)
\ No newline at end of file

nb.py

+a=['你好\n','dsalkf\n']
+with open (r'c:\Users\Windows 7\Desktop\新建文件夹 (3)\c.txt','a',encoding='utf-8') as file:
+    file.writelines(a)
\ No newline at end of file