auto save

diy.py

+with open(r"c:\Users\admin\Documents\lesson13-1\sales_list.txt","r",encoding="utf-8")as feli:
+    a=feli.readlines()  #读取所有行，放到变量a里面
+
+for i in a:    #用for... in...把每一行的数据遍历
+    data = i.split()    #把字符串
+    sum =0
+    for sales in data[1:]:
+        sum = sum + int(sales)
+    result = data[0]+str(sum)
+    print(result)
\ No newline at end of file

new_write.py

+a=["你好呀！\n","悟空\n","我在贝尔学python\n"]
+with open("c:\Users\admin\Documents\lesson13-1\hello.txt","a",encoding="utf-8")as feli:
+    feli.writelines(a)
\ No newline at end of file