auto save

diy.py

+with open(r'C:\Users\kk\Desktop\Sales_list.txt','r',encoding = 'utf-8')as file:
+    a=file.readlines()
+    print(a)
+
+#for i in a:
+#    data=i.split()
+#print(data[1:])
\ No newline at end of file

sales_list.txt

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    elif name != username:
+        print("用户名不存在,请重新输入!")
+    else:
+        print("密码输入有误,请重新输入!")
+print("欢迎来到贝尔编程!")