auto save

diy3.py

+username = 'python'
+userpassword = 123456
+while True:
+    name = input("账号：")
+    password = int(input("密码："))
+    if name == username and password == userpassword:
+        print("登陆成功！")
+        break
+    if name != username:
+        print("账号错误！")
+    if password != userpassword:
+        print("密码错误！")
+print("欢迎来到python世界！")