auto save

diy2.py

- 
+username = "python"
\ No newline at end of file
+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
+    print("用户名和密码错误!请重新输入")
+    if name!=usename:
+       print("用户名输入错误!") 
+    if name!=userpassword:
+       print("密码输入错误")  
+    if name
+       name=name+1
+    if name!=username
+       continue
+print("欢迎来到贝尔编程!")
\ No newline at end of file